Sharetops.com - A social bookmarking platform where users can make customizable web desktops to launch various links, games, & more.

Diigo.com - Free account allow for unlimited bookmarks but has limitations on some of its other features. The Firefox add-on is excellent.

friend

its cool, free and frendly :D

Sitemark.com - social bookmarking website with a nice layout. visually appealing. links can be put into folders, rated, and tagged.