This morning I booted* my machine, and when I pressed Alt-Tab to switch windows, black frames were drawn on the screen so I could see which window would be selected. Which is a really nice feature, and it looks really nice too. But yesterday it didn't do that. I did put a patch on my machine yesterday from SUSE, but it was a minor release so I wasn't expecting any new features.
(* My machine has taken to crashing regularly, so I've stopped using the NVIDIA drivers and switched to the open source nv drivers. But they don't switch my screen off, and I want to save my laptop's backlight - I'm on the third so far - so I'm switching off at night these days.)