Registered: 27/02/2003
Posts: 778
Loc: Washington, DC metro
I wholeheartedly second the wire pulls. I did that in my basement before the wallboard went up. Made the home theater setup much easier.
Also, make sure the floor plan is to your liking, too: You can make changes now much more cheaply than later. My folks did this when they bought their house - got a much larger kitchen, master bath and two finished rooms in the basement. Don't forget the home server room...