Super + W is great. But after all windows get displayed, I have to either click on one with my mouse or use the arrow keys. It would be better if each window turned into a letter, so I could access it quickly. Anyone know if this is possible? Thanks.
It is possible if you are a programmer and can patch the Unity Compiz plugin to achieve it. Otherwise, there is no existing solution that can provide that feature.
Apparently though, the Super-w Spread Mode in Ubuntu 12.04 will support selecting displayed Windows by number (eg '1' for the left-most window, '2' for the next window to the right, etc).