It doesn't tell me, just the size of the total category OTHER when I scroll over it, but my guess is that it is corrupt files as I"ve had some downloading erros, then restarts...that"s when I started to see the OTHER grow.
Files shouldn't be listed in "Others". They belong to the apps where they're stored.
If you haven't already done so, the usual fixes when something doesn't work as intended:
Restart your iPad: turn it off, wait for a few minutes and turn it on again.
Reset your device: press and hold Home and Power button at the same time until the Apple logo appears.
Force close apps:
iOS 6: double tap/four or five finger swipe upwards to reveal the multitask bar. Tap and hold an app there until they all start to wiggle, then delete them.
iOS 7: almost same procedure as before, when multitask bar is visible: tap one of the thumbnails above the app icons and drag them upwards towards the top of the screen.