This is definitely the best Windows Phone I've used. As a piece of hardware it is really beautiful. HTC's software does an admirable job of hiding most of WinMo 6.5's warts.

The hardware:
The screen is really big and beautiful. Super sharp, vivid colors. 480 x 800 resolution is great. This is a capacitive touch screen, so it works (as opposed to all the other WinMo phones). Only 2g support on AT&T, so that sucks. 1ghz Snapdragon processor makes everything snappy. My unit came with a 2gig microSD card.

The software:
The home screen is really impressive. Beautiful animations. Nice access to the basic functions of the phone. HTC has done a better job than most skinning the phone to cover up Windows Mobile UX. Some of it works better than others. The SMS view is okay, the email sucks.

The weather app is amazing, too bad it isn't very important.

Web browsing on pocket IE and Opera sucks. I expected more from Opera. However the Facebook and Twitter applications are solid.

Haven't spent a ton of time with the phone, but I'll try to share more later.