The good folks at Microsoft have built a great demo site to demonstrate the experience of Windows Phone. I have to admit, it looks very slick. Of course, using it in real life situations is another thing all together but so far things seem to work really well. One thing that always irked me about some versions of Android was that it felt clumsy and sluggish. Almost as if scrolling and smoothness were an after thought. Windows Mobile seems to have nailed the scrolling and smoothness factor for me. I don't know if I'd switch but I'm more likely to jump to something like this than Android. Direct link to the demo is below. Best viewed in a mobile browser.
http://m.microsoft.com/windowsphone/en-us/demo/index.html