"Other Data" Missing Music Fix
Iphone 3G, jailbroken, 3.0 OS
I had the issue of my music disappearing from the ipod player, and when I hooked up to itunes, it shows all that data as "other". I have read online that many have had this problem.
So, I used the iFile program (any SSH jailbreak file program would work), and found the music files, which were actually still sitting on the iPhone exactly where they should be. I deleted them all, then re-synched and added.
This fixed for now, without a phone restore!