[eviljeff]

you could spin it so it looks like a healthy hobby. emphasize your academic interest in poker - reading books, doing calculations, mentoring, participating in a group of bright individuals. I'd try to use "occasionally" and "in my spare time" and such liberally during an interview though. certainly don't get defense about it. also I wouldn't emphasize how much money you've won - many will think you just got lucky and were stupid for risking a large sum.