I discovered this tip today. It applies to my 16GB 3G iPad2, but don't know if this also applies to other generations also. Maybe someone can find out and supplement the info. Like many users, I regularly upload music, movies and other media to the iPad for consumption, but have found that the memory usage on it has been eaten up by a category called "Others", in addition to your music, movies, apps and pictures etc. At one point, the "Others" usage has slowly gone up to more than 6GB! I deleted all of the movies and music from the iPad but still more than 6GB is used by "Others", and as you know, for a 16GB iPad, 6GB is a lot of space for "Others" which I have absolutely no knowledge of whatsoever. I hardly play any games on it so it couldn't have been some huge saved game data. By going into "Settings > Usage" confirms I haven't been using a lot of space associated with my various apps... So where has all my space gone? I tried resync'ing after resync'ing and still couldn't get the "Others" space back. I am reluctant to reset everything because I hate to lose the settings I carefully configured. So I just decided to turn it off by holding the sleep button, let it power off and turn it back on again. Voila. Upon syncing with iTunes all the "Others" consumed space is now freed and I can upload more movies again. I can only guess that the "Others" space might be some temporary cache data which gets cleaned up by power cycling, but won't if you just leave it go to sleep nor by syncing with iTunes.