“This open event blends some pre-scheduled content with an open grid where the attendees fill in the sessions they either want to discuss or present themselves. It is the perfect space to provide the community at large with a place to connect with other attendees, learn more about elements of Web 2.0, and share one’s knowledge and experiences.” (Quote From the Web2.Open Site).
I found this thanks to Tara's Twitter feed.
I haven't decided if I'm going to attend or not. It's pretty hard for me to justify a purely web 2.0 conference with my open source job, unless I get invited to speak on an open source or community panel (hint, hint).