I spoke with AT&T about this last week and they said that they won't be able to do combined billing until later this year. They did add DirecTV to my bundle so that I could get the extra $5 per month off.
We just signed up for DirecTV and have all the movie channels free for 90 days. We watch more movies on Cinemax than all the other movie channel packages. Even with only 3 channels.
We used the Linksys Wireless G Game bridge connected by Ethernet into the DVR. It let us control the wireless setup from the console menu similar to our XBox. Great experience.