Glad to hear that MS will release windows phone 7 the end of 2010
The following link is a side by side compare between IPhone and windows phone 7

From the following link y can see the difference between
4 major smart phone OS:window phone 7,android,iphone and blackberry(why there is no symbian?)

Y may know already that windows phone 7 have a xbox live built in,that means there will be lot of funny games to play with:)

The support of RIM is really very very slow,it took me almost two weeks to have my signing key work.
Another thing boring me is the develop environment,it’s really very hard to use compared with windows mobile platform.
Anyway,start to debug my app from this week:)