Hmark is a very simple web application to share bookmarks written in Haskell+Happstack that I wrote during to learn Haskell.
It has two urls:
localhost:3000?url=http://url.to.save.com
Saves http://url.to.save.com in the database
localhost:3000
Redirects you to the last saved bookmark.
That is all!
The code is based on this code from John MacFarlane ans released under the GNU GPL v2.