Now that we've got a date and a location, Bar Campers can start claiming sessions. Here's a direct link to the claimed session page on the wiki. I've claimed the first session as an example.
Now, you don't need to claim a session to present at BarCamp, but if you do, it will help you get the word out, and it will help you find collaborators if you want to co-lead a session. BarCamps are very fluid, so please welcome people who want to work with you on a topic.
Now, quickly, a note about topics. Present about whatever you know and love. You want to lead a session about advanced refactoring techniques? Fine. A session about blogging for beginners? Fine. A session about robotics, or electronic music, or volunteering? Fine. A healthy spread of topics covering a variety of skill levels makes for the best unconferences. You may have 1 or 100 people in your session, but as long as you're teaching, learning and enjoying yourself - you've doing absolutely the right thing.
In other news, we've already got 40 BarCampers signed up! That's fantastic - make sure you tell your friends to sign up early, because we're going to be space and resource-limited to about 150 folks. Robin Dunbar would be proud.