IPhone: Resources to learn 'instruments'?

I'd like to use instruments to verify is my program doesn't have any memory leaks.

Can you please provide me with some resources or tips that helped you as you were trying to figure this out? Maybe some video screencasts, or something.

This program is pretty complicated and I'm not too familiar with such low level profiling utils so maybe you found a nice easy to understand tutorial as you were going through this?