I just went through this and found a program called "diskaid". Hope it's ok to say that out loud... It has a 14 day free trial, then 10 bucks. It lets you open files from your pc, without jailbreaking. My "other" had about 1 1/2 gig, labeled "album art". It wasn't really album art, I read that it may happen when an update is interrupted by a phone call. The "other" turns into kind of a junk drawer. I moved the files to my desktop (just in case I had to put them back) and gained over a gig without losing any function.