1) PC capture card. These come in a variety of price/quality combinations. You can pick up cheapy USB ones now that don't work too bad. They're verry laggy, which is no good for actual play, but is fine for capturing whole matches or just stills. You'll need to do some creative wiring so that you can send a signal to both your PC and TV/monitor at the same time.
2) A digital camera with "macro" mode. Keep it steady (ie: tripod, desk, etc - macro cancels out any sort of wobble control or autofocus). Turn the lights off in the room, and turn the flash off. Set it to macro mode (usually a little flower/tulip icon on the camera) and take a photo. Not as good as a direct capture, but the best way to shoot a screen with a camera (this is how the game reviewers of old did it, with proper RGB monitors for nice clear pixels).