I've been annoyed at having to plug the Xbox 360 Play and Charge kit into the (tight and hard to find) USB port at the back of the system to charge the wireless controller's battery.

Today I wondered if I could plug it into something else... so I plugged the Play and Charge kit into my PowerBook, and its charge light turned on! This is much more convenient, the controller can just sit behind my PowerBook's screen (which is on the island in the kitchen) and charge.