It's very convenient to dedicate a Space to be your Windows desktop if you run Windows alongside Mac OS all day like I do. I haven't tested with Parallels, but the latest Fusion release supports the Control-Arrow keys just fine, even when zoomed to Full Screen. [robg adds: A tester on the queue review site indicates that this works well with Parallels, too. I didn't think I'd use Spaces much at all, but I've found two really good uses for it so far in Leopard. One is for virtual machines, and the other is for screenshots, which I obviously do a lot of -- I use Backdrop and/or Desktop Curtain, and I have them set to run in their own space.]

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