diff --git a/README.md b/README.md
index 2b92032..391f064 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ go get launchpad.net/goyaml
 go get launchpad.net/goamz/aws
 go get launchpad.net/goamz/s3
 go get github.com/howeyc/fsnotify
+go get github.com/extemporalgenome/slug
 ```
 Once you have compiled `jkl` you can install with the following command:
 
diff --git a/post.go b/post.go
index d124bf9..5de2e13 100644
--- a/post.go
+++ b/post.go
@@ -6,15 +6,42 @@ import (
 	"path/filepath"
 	"strings"
 	"time"
+	"github.com/extemporalgenome/slug"
 )
 
 var (
 	ErrBadPostName = errors.New("Invalid post name. Expecting format YYYY-MM-DD-name-of-post.markdown")
 )
 
+func getPostUrl(title string, date time.Time, categories []string, permalink string) (url string) {
+	switch permalink {
+		case "date":
+			permalink = "/:categories/:year/:month/:day/:title.html"
+		case "pretty":
+			permalink = "/:categories/:year/:month/:day/:title/"
+		case "none":
+			permalink = "/:categories/:title.html"
+	}
+
+	url = permalink
+	url = strings.Replace(url, ":title", title, -1)
+	url = strings.Replace(url, ":year", fmt.Sprintf("%02d", date.Year()), -1)
+	url = strings.Replace(url, ":month", fmt.Sprintf("%02d", date.Month()), -1)
+	url = strings.Replace(url, ":i_month", fmt.Sprintf("%d", date.Month()), -1)
+	url = strings.Replace(url, ":day", fmt.Sprintf("%02d", date.Day()), -1)
+	url = strings.Replace(url, ":i_day", fmt.Sprintf("%d", date.Day()), -1)
+
+	for i, value := range categories {
+		categories[i] = slug.Slug(value)
+	}
+	url = strings.Replace(url, ":categories", strings.Join(categories, "/"), -1)
+	url = strings.Replace(url, "//", "/", -1)
+	return url
+}
+
 // ParseParse will parse a file with front-end YAML and markup content, and
 // return a key-value Post structure.
-func ParsePost(fn string) (Page, error) {
+func ParsePost(fn string, permalink string) (Page, error) {
 	post, err := ParsePage(fn)
 	if err != nil {
 		return nil, err
@@ -34,13 +61,9 @@ func ParsePost(fn string) (Page, error) {
 		post["title"] = t
 	}
 
-	// figoure out the Posts permalink
-	mon := fmt.Sprintf("%02d", d.Month())
-	day := fmt.Sprintf("%02d", d.Day())
-	year := fmt.Sprintf("%02d", d.Year())
-	name := replaceExt(f, ".html")
-	post["id"] = filepath.Join(year, mon, day, f) // TODO try to remember why I need this field
-	post["url"]= filepath.Join(year, mon, day, name[11:])
+	// Figure out the Posts permalink
+	title := replaceExt(f, "")[11:]
+	post["url"] = getPostUrl(title, d, post.GetCategories(), permalink)
 
 	return post, nil
 }
diff --git a/post_test.go b/post_test.go
new file mode 100644
index 0000000..9ae89be
--- /dev/null
+++ b/post_test.go
@@ -0,0 +1,171 @@
+package main
+
+import (
+	"testing"
+	"time"
+)
+
+func TestPermalinkTitle(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-11")
+	url := getPostUrl("my-blog", date, []string{}, "/:title/")
+
+	if (url != "/my-blog/") {
+		t.Errorf("Expected url [/my-blog/] got [%s]", url)
+	}
+}
+
+func TestPermalinkYear(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-11")
+	url := getPostUrl("my-blog", date, []string{}, "/:year/")
+
+	if (url != "/2013/") {
+		t.Errorf("Expected url [/2013/] got [%s]", url)
+	}
+}
+
+func TestPermalinkMonth(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-11")
+	url := getPostUrl("my-blog", date, []string{}, "/:month/")
+
+	if (url != "/11/") {
+		t.Errorf("Expected url [/11/] got [%s]", url)
+	}
+}
+
+func TestPermalinkMonthWithOneDigitMonth(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-02-11")
+	url := getPostUrl("my-blog", date, []string{}, "/:month/")
+
+	if (url != "/02/") {
+		t.Errorf("Expected url [/02/] got [%s]", url)
+	}
+}
+
+func TestPermalinkIMonth(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	url := getPostUrl("my-blog", date, []string{}, "/:i_month/")
+
+	if (url != "/11/") {
+		t.Errorf("Expected url [/11/] got [%s]", url)
+	}
+}
+
+func TestPermalinkIMonthWithOneDigit(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-02-01")
+	url := getPostUrl("my-blog", date, []string{}, "/:i_month/")
+
+	if (url != "/2/") {
+		t.Errorf("Expected url [/2/] got [%s]", url)
+	}
+}
+
+func TestPermalinkDay(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-25")
+	url := getPostUrl("my-blog", date, []string{}, "/:day/")
+
+	if (url != "/25/") {
+		t.Errorf("Expected url [/25/] got [%s]", url)
+	}
+}
+
+func TestPermalinkDayWithOneDigit(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	url := getPostUrl("my-blog", date, []string{}, "/:day/")
+
+	if (url != "/01/") {
+		t.Errorf("Expected url [/01/] got [%s]", url)
+	}
+}
+
+
+func TestPermalinkIDay(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-25")
+	url := getPostUrl("my-blog", date, []string{}, "/:i_day/")
+
+	if (url != "/25/") {
+		t.Errorf("Expected url [/25/] got [%s]", url)
+	}
+}
+
+func TestPermalinkIDayWithOneDigit(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	url := getPostUrl("my-blog", date, []string{}, "/:i_day/")
+
+	if (url != "/1/") {
+		t.Errorf("Expected url [/1/] got [%s]", url)
+	}
+}
+
+func TestSingleCategory(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{"My Category"}
+	url := getPostUrl("my-blog", date, categories, "/:categories/index.html")
+
+	if (url != "/my-category/index.html") {
+		t.Errorf("Expected url [/my-category/index.html] got [%s]", url)
+	}
+}
+
+func TestMultipleCategories(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{"Go Lang", "Unit Testing"}
+	url := getPostUrl("my-blog", date, categories, "/:categories/index.html")
+
+	if (url != "/go-lang/unit-testing/index.html") {
+		t.Errorf("Expected url [/go-lang/unit-testing/index.html] got [%s]", url)
+	}
+}
+
+func TestEmptyCategories(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{}
+	url := getPostUrl("my-blog", date, categories, "/:categories/:title/")
+
+	if (url != "/my-blog/") {
+		t.Errorf("Expected url [/my-blog/] got [%s]", url)
+	}
+}
+
+func TestUnicodeCategories(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{"áãàâäçéèëíìïóòôöúùûü"}
+	url := getPostUrl("my-blog", date, categories, "/:categories/:title/")
+
+	if (url != "/aaaaaceeeiiioooouuuu/my-blog/") {
+		t.Errorf("Expected url [/my-blog/] got [%s]", url)
+	}
+}
+
+
+// The 'date' permalink is a shortcut to /:categories/:year/:month/:day/:title.html
+func TestDateBuiltinPermakink(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{"go"}
+	url := getPostUrl("unit-tests", date, categories, "date")
+
+	if (url != "/go/2013/11/01/unit-tests.html") {
+		t.Errorf("Expected url [/go/2013/11/01/unit-tests.html] got [%s]", url)
+	}
+}
+
+// The 'pretty' permalink is a shortcut to /:categories/:year/:month/:day/:title/
+func TestPrettyBuiltinPermakink(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{"go"}
+	url := getPostUrl("unit-tests", date, categories, "pretty")
+
+	if (url != "/go/2013/11/01/unit-tests/") {
+		t.Errorf("Expected url [/go/2013/11/01/unit-tests/] got [%s]", url)
+	}
+}
+
+// The 'none' permalink is a shortcut to /:categories/:title.html
+func TestNoneBuiltinPermakink(t *testing.T) {
+	date, _ := time.Parse("2006-01-02", "2013-11-01")
+	categories := []string{"go"}
+	url := getPostUrl("unit-tests", date, categories, "none")
+
+	if (url != "/go/unit-tests.html") {
+		t.Errorf("Expected url [/go/unit-tests.html] got [%s]", url)
+	}
+}
diff --git a/site.go b/site.go
index ea3fb25..2271aaa 100644
--- a/site.go
+++ b/site.go
@@ -9,6 +9,7 @@ import (
 	"mime"
 	"os"
 	"path/filepath"
+	"strings"
 	"text/template"
 	"time"
 )
@@ -162,7 +163,14 @@ func (s *Site) read() error {
 
 		// Parse Posts
 		case isPost(rel):
-			post, err := ParsePost(rel)
+			permalink := s.Conf.GetString("permalink")
+			if (permalink == "") {
+				// According to Jekyll documentation 'date' is the
+				// default permalink
+				permalink = "date"
+			}
+
+			post, err := ParsePost(rel, permalink)
 			if err != nil {
 				return err
 			}
@@ -221,6 +229,9 @@ func (s *Site) writePages() error {
 
 	for _, page := range pages {
 		url := page.GetUrl()
+		if (strings.HasSuffix(url, "/")) {
+			url += "index.html"
+		}
 		layout := page.GetLayout()
 
 		// is the layout provided? or is it nil /empty?