I think I'll also put in an empty PVC conduit from the basement to the attic for future expansion.
This is a great idea. I just built a house and I remembered to do this. I got to use it when they came to install the wireless (I am out in the country but up on a hill so I can WiMax to the watertower 5 miles away, 1.0 meg service is better than dial-up and a lot cheaper than satellite) and even though the rep on the phone assured me that I just need coax (RG6) for their installation, the installer gets here and tells me that guy is an idiot and they use cat5e. So instead of having to fish cat5e (I actually used cat6 everywhere) through two stories to get from the attic to the basement, I just dropped it down one of the three 1.5 inch PVC conduits i ran along side the clothes chute. One of the best 'extras' that I added while I was building this place.