I’m planning to move on Windows 8 since Windows 7 doesn’t native supports multiple taskbar’s, not to mention that I have to use nView to set separately wallpapers for each monitor. Right now I’m re-designing my workplace, trying to accommodate with the new set up, maybe do some little changes.
The best thing about Windows 8 is that will give user the option to have taskbars on all monitors, and the launched apps displayed in the taskbar either all opened, or only visible on the current working monitor, not to mention that you can set different wallpapers to each monitor (this should be already possible?! well… it’s not!)

I’m waiting for Windows 8 Release Preview which hopefully will be released in 1st of June (6/7 days left) to make the transition…
what is the difference between windows8 C.P and R.P ?
In terms of visuals, they tweaked the windows, and the start menu a little bit, improved corners for dual-monitors setups (6px which stops the mouse to move to the other monitor), start menu on each screen, but internally I guess a lot more, can’t really say as I didn’t have too much time to play with it. The bad thing, as far as I’ve read on build windows blog is that they will remove the aero transparency completely, and replace it with non-transparency windows, which sounds and will look stupid if you ask me.
yeah, that will be suck… thanks for answer;)