This is one of my absolute favorites. It's one of those songs where the lyrics are simple and right to the point, yet don't lose any of there impact or seem stereotypical.

The three versions I have:

Ain't No Sunshine - Bill Withers - Greatest Hits
Ain't No Sunshine (Groove Corporation Dub) - Stryke - Staying In
No Sunshine - DMX - Exit Wounds

The Bill Withers version is by far the best, but the Stryke and DMX versions are both good (albeit quite different) in their interpretation of the original.