Now to enrich my "KM and Folk Knowledge: Lessons from Social Software" paper...

Dmitri Popov talks about an open-source alternative to del.icio.us in his article "Social bookmarking with Scuttle".

He offers a simple recipe to migrate from the proprietary to the open source. (Read: Just add PHP and MySQL.)

One feature that could be music to my ears (literally), Scuttle comes with an MP3/Ogg player. Wicked!
His conclusion:- "It's impossible not to like Scuttle: it not only offers most of del.icio.us' functionality, but also sports useful additions that makes it suitable for individual users and workgroups alike. If you ever wanted to set up your own bookmarking system, Scuttle is just the ticket." More here.