It is not exactly what you need, but may be it can help you.
I wrote a little program for it.
Usage: Move the mouse to the left side of the screen = pressing ALT+TAB
Staying there and scroll with the mouse = switching between apps
Download: MyAltTab v2
I hope the link works! It is the first time I use skydrive.
Everyone who try it please send feedback (pm)!
ps: drag&drop works too
I made it with 3Dflip also: My AltTab v3