Okay Basally, right now I'm on 2.2.1 FirmWare for my iPod Touch 2G. Since then, I've downloaded a Hell of alot of Packages/Sources from Cydia, and I've bought alot of Applications. What I'm wonder, is if I go to iTunes, and Upgrade to 3.0.1 - Will it delete my Applications from Cydia, and will it Un-Do my JailBreak? Also, what will happen to all my Music? Will it clear my iPod all together, and will I have to do everything again, or what?