One of the things I like about OS X is the exposé styled window switching and I found that was lacking on Windows. I do like how Microsoft have made the alt+tab nicer in Windows 7, but I wanted more. I wanted that OS X style, which can be achieved with a nice utility called Switcher.
I have Switcher set to alt+tab and gives the feel of exposé. I have also installed another small utility called SmallWindows which can set a “hotspot” for your mouse which will activate the exposé style switching too. I have mine set to the top-right corner.