Thanks guys for the suggestions - I appreciate it. It's helpful to know some of the key differences between the Windows C++ world and Mac Obj-C ahead of time.

As far as what I want to do, there isn't any particular answer at this point. There are a couple random and simple apps I want to try out, but other than that I'm just looking for a good foundation - which sounds like understanding the currency converter app top to bottom, getting familiar with Obj-C, Xcode 2, interface builder, etc.. This should help ease me into learing more complicated stuff as my inspiration heats up.