Im about to start the iTunes U Stanford iOS programming class. The thing is, I'm running 10.6 on my Mac, and Xcode 4 is only available on 10.6 if you pay the $100 developer fee (which I'm hoping not to do until I'm actually working in n app, not just learning my way around). The class says it's updated for iOS 5. For those who have taken it or at least looked at it, do you think I could get away with using Xcode 3 or do I need to be working with the latest version? Or am I missing something and this is not actually a problem?