Spaces and Expose Overview using the 2nd Monitor
As far as I know, it’s not possible to show the Spaces Overview on both screens. It will always be shown in the primary display and the other will fade to black. I haven’t come across any utility that does that. Hyperspaces is nice, but it doesn’t do that. Although if you really use spaces, I’d recommend you give it a look. Read their blog and possibly ask the author if such thing would be possible for future versions. He’s working on version 2.0 at the moment and you never know… :)