Popular Mechanics has a cool article about a guy who will sell you a bookcase with a built in motor - so you can be like Batman and have secret doors in your house that swing open with the touch of a button.
I'm not sure how useful it would be in my house. I mean, I'd like a secret door, but I want it to lead somewhere nifty.
A secret door to just another room
I need an Egyptian tomb,
or maybe an intergalactic
wormhole of doom.