TV programming, audio systems, Internet access, another area that's more comprehensive I had originally thought. I guess that's the fun part: learning about things I didn't even know existed. Thank you Al Gore for inventing the Internet :-)
We're looking into systems of AMX, Crestron, and Visiomatic (German). And also just learned about video servers of Kaleidescape and an audio solution from Sonos. That's all I can say at this point really. Still trying to figure out and how all those systems work together and what I need, but learning fast.
It's obvious that with enough $$ you can do anything but the idea is to find a reasonable balance between comfort, convenience and cost.