TV Distribution

As some of you already know, I have a lot of TVs.  I mean ALOT of TVs.  I've cut down recently a bit but at last count I was up around 15.  I've also been a loyal Directv subscriber for nearly 15 years.  A while back my Father in Law moved in with us and because he had always had cable and didn't really want to learn a new system, he subscribed to cable even though we had a dish.  Well, after 6 years, he's finally learned how to use the DTV receiver and is ready to ditch cable.  That's fine with me, but it does present a problem.

As I said before I have a lot of TVs.  I also have 5 Directv DVRs, 4 at the house and 1 at the office.  You'd think that'd be sufficient, but no.  When he subscribed to cable we could pump that signal to any "secondary" TV we had in the house but that's soon going away.  So, here's were I'm enlisting the advice of the 2o2p community. 

Is there a good system for distributing AV through the house to multiple TV locations.  For now the other TVs that would receive the signal are all standard def. units but if the signal could be distributed in HD that would make upgrading those TVs later easier.  It would be even sweeter if there were some sort of way to do it wirelessly over the network but that may be reaching.