Here it is, the obligatory Hello World app. XCode is pretty cool. I feel comfortable with it after just a few minutes. I got a simple app together, got the iPhone Simulator to run, stepped through some code in the debugger and read some documentation. I still don't know what the frack I am doing, but it's a start.
Also, am currently reading the iPhone OS Programming Guide (in all of its two-sided printedness glory). That is probably a better starting doc than the Objective-C one.