Xcode\'s debugger console makes it easy to see any debugging messages my app sends out using NSLog(), but it always sticks a timestamp prefix on them:
NSLog()
In the top left corner of the console window there is a pulldown menu that says All Output / Debugger Output / Target Output.
Select Target Output. It worked on my older versions of Xcode, but to be honest with you it doesn't with my current 4.3 version.
I hope this helps you.
JR