I upgraded my work mac pro to Leopard
since protools is not on that one. And I have been using spaces on it all day. Just the spaces feature makes it worth the 129 bucks. Shit if a third party company released something as good as spaces for 129 bucks I would have ponied up the cash.
Being able to organize your work by workflow in individual spaces is such a productivity boost in itself, And control arrow is the perfect key combo for it
I have dual 23inch cinemas and had 8 virtual desktops going (4 spaces x 2 displays) And when you put your windows in the order you want, you can use muscle memory to go through your work and switch accordingly. etc..
On that box I was using up 5 gigs of ram, lots of stuff going on an that is where the speed difference shows up even more than ever.
I cannot wait till its officially available for order