After watching these videos i've been pretty much sold on Windows Phone 7. My only complaints are the lack of true multitasking (limited multitasking), lack of access to a file explorer, and sideloading apps.
All of which can be added with a update or something but this walkthrough is pretty detailed and makes me want to try the os out. I hope it does well as soon as HTC releases a phone with a screen as big or bigger than the tp2, and a slide out qwerty im trying it out.
it looks pretty good aside from alot of our complaints
part 1
http://www.youtube.com/watch?v=WIns2aDCx4k
part 2
http://www.youtube.com/watch?v=5_lHMuzA2wg
part 3
http://www.youtube.com/watch?v=jsICknWejpE
part 4
http://www.youtube.com/watch?v=_iuyUSn3BTU