Journal: Programing for the iPhone - where to start?

I'm interested in programming for the iPhone. Though I've been programming for a long time I haven't worked in any 'flavor' of C for two decades! I do have a Mac and also an iPhone (3G). I looked at a couple of books but they seem to have been written mostly for the jailbreaking community and older (strange to use that word in such a new device!) SDK/firmware. So, where can I start? Do the tutorials that come with the SDK really help you master the environment and language? Are there online communities where one can get help? The recent changes in the NDA from Apple, will that help new developers?