And, for the love of god, if you're experiencing lag, don't try to run music in the background (I.E. Pandora) Even running the music you have downloaded to your device will slow it down. Just turn off the tunes, keep a few hundred MBs of space available and don't have 50 apps running in the background simultaneously. Anyone runnins iOS 4 or up I think, can exit out of backgrounding applications. This will give you a nice speed boost.