Michael Sikorsky and I will be teaching iPhone Dev School again this weekend, at the University of Calgary.
For a sample of what you can expect to learn if you attend, we have "leaked" the following recipe: BlueTooth Recipe, which outlines how to use the GameKit library in iPhone OS 3.0. This is just one of the many things that will be covered this weekend.
No experience is necessary; day one is spent getting everyone up to speed on how iPhone development works, what all the different pieces are, and getting familiar with the tools. In day two, we spend more time giving students quick introductions to various APIs that are available, both from apple and third parties. We also discuss the app store from our own real world experience.
If you are interested, there are more details on Michael's blog.
We hope to see you there!