Think you could do better than del.icio.us, Furl, and Yahoo! My Web? Well, now's your chance: Scuttle is an open source social bookmarking engine that you can run on your own site. It's based on PHP and supports most of the del.icio.us protocol, meaning developers who have made tools for del.icio.us can easily adapt them to Scuttle. Unfortunately there's no unified feature list for Scuttle, but you can see it in action at Scuttle.org. If you want to get started on your own social bookmarking site right away, you can download Scuttle's source code at SourceForge.