Sure, most people won't need it, but you can't complain about free.
It's easy to take pot-shots at Best Buy for the Geek Squad installation programs they've got set up. Charging people for installations they could easily perform themselves is a bit slimy, and the prices are at the threshold of ridiculous.
It's hard to criticize free installation though. If you pick up a Sony Internet TV or Sony Internet TV Blu-ray player (worst name ever?) you'll get it delivered to your house and installed for free. Unnecessary or not, having someone bring your new TV into the house for you is nice.
There's no word on how long Best Buy's free installation and delivery is going to last, but expect it to hold out through the holidays at least. If you get the Logitech Revue, by the way, you're out of luck - no free installation for you.