Hi there,
I recently upgraded to Snow Leopard and was shocked to see that Apple have not kept up support for DVI to S-Video output. The output on screen appears in greyscale and poor quality. Even with restarting I had the same problem. The latest patch for Snow Leopard doesn’t seem to have anything to fix this problem so I was left with no alternative but to revert back to Leopard or lose my TV in my room, no thanks. Also upon upgrading I lost some widgets I used such as MenuMeters and my replacement for the time stopped working also.
Luckily I had a backup with Time Machine from a few days ago which could be restored!
Beware of Snow Leopard!
EDIT: I’ve just upgraded again and these issues appear to be fixed, damn right!