If you're looking for hardware comparison—just about every major manufacturer will have at least one Windows Phone 7 handset at launch, and it will be available on almost every carrier worldwide (except Verizon)—go here. If you want to take a look at the interface, this video has been online since February.
I think it looks really, really slick. And I get a little nervous at really, really slick—it looks like information isn't arranged in any particular way besides what is most aesthetically pleasing. Which is funny, because pro-Microsoft critics have been leveling the pretty-but-superficial charge at Apple for well over a decade now. But I'll reserve judgment until I play around with one and see how customizable it is. What about you?
Are you interested in switching to Windows Phone 7?