I just came across a news posting concerning Compiz/Beryl, a 3d window manager for Linux. It has a feature that allows you to browse through the windows of your currently running applications in a Coverflow style, see here. That's something I'd like too see in Mac OS as well.. make command - tab give me a coverflow view of my running applications. What do you think? Or is it even possible already, through some add-on?