It has long been known that WP7 supports the development of XNA games that were previously made for desktop and Xbox Live. Now most of the arcade games from Xbox Live can be ported to the WP7 mobile platform. ')
Windows Phone 7 will offer full integration of your mobile with Xbox Live:
your avatar from Xbox Live with all the changes will be downloaded to your mobile;
support communication with Xbox Live contacts: view their status, activity and what they are playing. Chat via Xbox Live;
search, purchase and download games already purchased;
Xbox Live support for WP7 games and full control of achievements via mobile;
multiplayer support for turn-based games with players on WP7 or PC;
Access Xbox LIVE Spotlight for news, codes and other information.
The starting lineup of games contains such famous titles as: Assassins Creed, Castlevania, Crackdown 2, Earthworm Jim, Guitar Hero 5, Halo Waypoint, Puzzle Quest 2, Splinter Cell Conviction, Star Wars. Full list of starting line under the cat. There are several demonstration videos available on the Engadget website .
Games on the launch of Windows Phone 7:
Microsoft promises even more games before the Christmas holidays and the release of new games from Xbox Live to WP7 every week, as happens on the Xbox 360.