git-annex allows managing files with git, without checking the file contents into git. While that may seem paradoxical, it is useful when dealing with files larger than git can currently easily handle, whether due to limitations in memory, checksumming time, or disk space.

Got into this trouble with my iPad running firmware 4.2 beta 2. Delete the current backup solves the problem.

AddressBookSync is a free Mac OS X application to download profile pictures and other Facebook data to Address Book cards. This is a handy tool to keep your contacts' pictures updated if you have numerous Facebook friends in your Mac OS X Address Book.