in terms of distributing HD from one STB to several TV's through out your home currently it is extreamly expensive.
There are NO wireless solutions on the market yet. With the on set of 802.11N and MIMO technologies, and Ultra wide band you will soon start to see wireless HDMI and such but currently there is nothing on the market that works.
Now with that said there are several things you could do, first a component video, you can get a distribution amp like this: http://www.smarthome.com/8145h.html
one component video source will feed 5 different TV's, things like these are what Best Buy, Circuit City, ect... will use to distribute component HD video to several TVs.
For HDMI you can use the same concept and use a HDMI splitter, however they are expensive as crap, here's a 2 x splitter: http://www.monoprice.com/products/pr...ormat=2&style=
then you've got even more expensive HDTV distribution kits like these: http://www.smarthome.com/77707k.html
whats nice about the above kit, is it uses cat5 to distribute the hd video instead of a having to run component or hdmi cables you can use cheaper cat5 which is much easier to run.
so there are many things out there you can do, it just depends on how much time, effort and $$$$$$ you have.