Movies run smoother and the overall system is quicker when navigating around. Threre's a free overclocker called TurboTray 498 at
http://elevatedstudios.com/pocket/
Make sure you set your power profile processory speed to normal, reset the system and run turbo tray. You can also set it to clock down to 100Mhz. I've gain a lot of batt life from this. I havent really noticed faster battery drain from 498Mhz.
Rob