Looking for a good FaceBook App development tutorial

I've been playing around with building FaceBook apps for a few kicks, and I've got a question for all you FB app developers out there. I've read the wiki, done the step-by-step, gone through the anatomy of an app, installed the Footprints app and played around with it, but now I'm looking for a little bit more - are there any good online tutorials that take someone beyond the simple act of writing your first app? Any recommendations on sites or groups to join? Leave a comment, or drop me an email at david AT sifry DOT com.

Thanks in advance!

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