On the Zend Developer Zone today there's a new post from Michaelangelo van Dam, the organizer of the unconference at this year's Zend/PHP Conference with an overview of what you can expect while you're there.
Community is all about getting involved and sharing knowledge and best practices. At ZendCon you'll get a chance to step up and share your knowledge and skills to everyone at the conference with the ZendCon uncon. These Uncon sessions are run separately from the main tracks and are open for everyone. Wether you're an attendee, a conference speaker, a sponsor or part of the conference organization, you're welcome to step up and share with the community.
He talks about the types of sessions you can propose - regular talks and lightening talks - how to register your sessions, what you might want to provide (slides, other content) and how you can know which uncon sessions are coming up (hint: follow @zenduncon.