I've seen that damn Negreanu "So why PokerStars?" commercial an ungodly amount of times. It's annoying as hell, but I noticed in one of the shots he is playing online poker on this laptop and is using some weird device on his finger. I thought it looked pretty neat so I bought one. This thing friggin' rocks. Took a bit to get use to the control but now I love it. Here is where I bought it from, $17 shipped:
http://www.buyextras.com/ps2fintracmo.html
I'd imagine there are probably better ones out there, this feels kinda light and I think it would be better strapped to my hand, but it's still sexy.