I was on 3.0 jailbroken
I restored to 3.1
I checked and I saw there was already 500mb used for the "other category" but whatever just 500mb
I used redsnow to jailbreak and then downloaded ********** cycorder and a few jb apps.
I checked on itunes and I now have 5GB of others data.

W-T-F.

Anyone know how I can get my entire 7.1gb back ? (iphone3g8gbvista32)