There's a ton of poker time software out there and even some nifty looking dedicated hardware. At the games I attend we'll usually use a computer for the timing, but often there isn't one in the room and no one wants to bring over a laptop. However, there is almost always a TV with DVD player in whatever room gets temporarily re-purposed as the game room.
That got me thinking that a DVD that could serve as a poker timer would work in all the rooms in which we play poker and would offer these other benefits: