This year there are separate tracks for MySQL, OpenSolaris and Linux, Web scale computing and more. A panel in the AM features Marten Mickos from MySQL, Matt Assay from Alfresco, Jim Zemlin of the Linux Foundation, and Ian Murdock of Debian fame.
Or join the RedMonk analysts for a day long "unconference" focused on open source.
For information on sessions and registration, go to: http://developers.sun.com/events/communityone/
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If you can't make it to San Francisco this May, CommunityOne sessions will be streamed out to the Net. Visit: http://developers.sun.com