Some interesting and in-depth WP7 Previews hit the wire today.  Check them out!

http://www.engadget.com/2010/07/19/windows-phone-7-in-depth-preview/

http://www.cnet.com/8301-17918_1-20010780-85.html

http://www.winsupersite.com/mobile/wp7_handson_03b.asp

http://www.zdnet.com/blog/cell-phones/definitive-guide-to-the-microsoft-windows-phone-7-technical-preview/4286

http://www.pcmag.com/article2/0,2817,2365546,00.asp

Edit: Great summary at Windows Phone Secrets

Have fun reading!