Chuck, I got them too. I haven't seen one for awhile, but my best guess is that they are behind the drywall in my basement. I pulled down the old paneling that was there, and one would come running out every now and then. I know what you mean about them being fast. Are yours gray or light brown.
Try putting some ant poison around your baseboards, and in the basement up around the floor joists and floor too if you have a finished basement. I don't know what they eat but maybe if they track through this stuff if might kill them.
Your right about the freak out factor. I'll be laying on the couch watching the boob tube and one of those things will come trucking across the carpet, see me move and he splits back for the wall. He has about 2 steps to live before he gets smashed.