They have a ton of channels. Pretty obscure and very specific. Some have commercials and some cost money but for the most part they're all free. There's some news from them as well about adding more content:
Roku celebrates 700 channel milestone with new partners: Coby, Harmon Kardon and others now Roku Ready
It's a great little device, we love ours for Netflix and Amazon. I REALLY wish they'd add support for YouTube though. That'd really make it perfect. Fortunately our Blu-ray has YT support (albeit, super slow).
Oh, never heard of the game. Really not a gamer at all either.