My others has been up to almost 4gb.. People have said its because of a sync that was cancelled causing a corrupt database.
The way I got mine back down to under 1gb was to make sure all the apps that saved files such as pictures and videos were cleared - Supr8 had loads of videos still in the app that id already transfered to my computer!
then I synced my phone without syncing any music to it, and then resynced with the music.
others went back down to 0.87gb
I think I found the fix to this after doing a Google search. I have cleared the other file up on all our devices (ipod, ipad2, and iphone). I followed this link: http://apple.stackexchange.com/questions/8456/how-can-i-clean-up-other-storage-o n-iphone-3g
It worked the first time on all the devices except the Iphone 4 I had to do it a couple of times.