I attended this event last year and was one of the best things I could have done. The entire "unconference" is planned by its participants so you can't go wrong signing up for this one! My favorite part last year was the smackdown which allowed lots of people a few minutes to quickly run through new and exciting findings in educational technology including sharing iphone apps, websites, etc. This is a great one to do if you will be there on June 26th!
The main edubloggercon site: http://www.edubloggercon.com/
The classroom 2.0 ning where you can mark your attendance: http://www.classroom20.com/events/edubloggercon-2010-the-social