AT&T Windows Phone 7 users can login to AT&T U-verse Mobile between now and December 31, 2010 and watch TV programming available from the service free for 30-days. Trial users will be automatically subscribed to the service at a rate of $9.99 per month after the trial ends. So, be careful if you try out the service.
The list of TV programs available is found here.
It looks limited to Disney/ABC content plus PBS Kids:
ABC, Disney Channel, ESPN, Discovery Channel, TLC, ABC News, Animal Planet, ABC Family, Disney XD, PBS Kids.