Slade, and there are so many more product lines. There are extremely high end and the very cheapo X10.com products.
High end lighting control such as AMX or Crestron can run $4000.00 per room.
Low end can run at arrond $40.00 per room it just depends on what and how you want to control.
New lighting Contol uses dedicated lines for 100% reliability such as the Mural System, Lutron RA uses Radio Frequency to send the signal to your lights. The newer technologhy boosts digital enhancements while the old technology is analog.
If I was starting fresh, and I will be going in this direction soon. And it is all about using the most to control everything. Such as using my PDA and Smartphone to control my lights, or using the internet to create lighting scenes for a client. Using my PC to control and actually be my home theater.
It is Windows Media Center PC with Home Control by HAI. They also have a line of the new digital scene switches that use the UBP technology.
Check it out from here:
http://www.homeauto.com/Best of luck and keep us posted with decisions.