Ok so i've had this problem for a few months now and decided to finally figure out whats going on. I was on 2.0 for a long time and only had a few appstore apps at a time (10 or so) plus 1.2gb of music and no videos but I had cydia and liek 3 apps. Anywasy in itunes where it shows ur memory usage it says I'm using 3.89GB of OTHER, and idk what that could be? I tried deleting alomst all apps, didnt help, music, didnt help etc...so now i thouhgt that upgrading to 3.0 would help so after my upgrade i still have 3.89gb in use and only 900mb (was down to 12mb the other night) left. What is all this stuff and how do i get rid of whatever it is? the 3.0 upgrade deleted all the cydia stuff so i know it's not that but then wtf is it? could an appstore app be takign up a large ass amount of space or what?