...
Personally, I'm quite happy with Windows 7
Me too, but each to their own
For the alt-tab thing there, there is a bug that does the same thing with one extra key press:
http://www.howtogeek.com/howto/5200/stupid-geek-tricks-windows-7-easter-egg-shows-the-xp-alt-tab-prompt/Why you would want to I don't know...
I even change Firefox to show something similar to alt-tab when pressing ctrl-tab (change something in about:config, will post when I find it again)
EDIT: I tracked down that Fx thing
Can't remember where I saw this, but in about:config, change "browser.ctrlTab.previews" to true. Then when you press Ctrl-tab you get previews of each tab, good if you have loads open