http://www.proteron.com/ has a product called 'LiteSwitch X'.

It's an Alt-Tab switcher that shows/hides like Windows' Alt-Tab switcher. Configurable key command - I prefer Command-Tab.

It orders the applications as Windows does - in order of most recently used.

Quite useful. Quite free. And they added a preference to allow you to disable the fading it does when it shows up, to make it "seem" faster.