In iTunes I right clicked on my iPad and selected "create a backup". It then spent quite some time doing that.
Once that had finished I updated the software on the iPad because I've got a developers license and was upgrading to iOS 5 Beta 4. Once it had finished that it asked if I wanted to restore my iPad from an earlier backup. I selected the one it had done just before I updated the software and it spend the best part of an hour transferring everything.
Unfortunately when I now go to my iPad, none of the videos that I had recorded (within the videos app) are there. I know it's a long shot but if anyone has any idea if they can be recovered then I'd be very grateful as there were some important videos on there!