The Unconference concept has become very popular in recent years (Oracle offered its first OpenWorld Unconference at Oracle OpenWorld 2007). The Unconferences for JavaOne 2010 and Oracle Develop 2010 are featured on this Wiki page. There are numerous slots still available for anyone interested in organizing an Unconference topic, but several topics are already scheduled. The Scheduled Sessions Descriptions page provides descriptions of a few of these.
The Unconference sessions are being held in conjunction with JavaOne and Oracle Develop. They will be held 20-23 September 2010 in the Hotel Parc 55 from 9 am to 5 pm on Monday through Wednesday (20-22 September) and from 9 am to noon on Thursday, 23 September.
I blogged previously on how difficult it is to decide which presentations to attend at JavaOne. It becomes even more difficult to decide what to attend during the conference when Oracle Develop sessions and the currently scheduled and potentially scheduled Unconference sessions are added into the mix. The Oracle Wiki page What to Expect at the Unconference provides an idea of what to expect at an unconference.