ATI has just announced the details on two new TV tuner cards: the $129 TV Wonder 650 and the bargain basement $59 TV Wonder 200. The 650 can capture over the air digital TV and analog signals, while the 200 is an analog only card. The 650 also includes PVR software, while the 200 makes do with the basic recording capabilities of the ATI Catalyst Media Center. Both are also certified to work with Windows Media Center Edition and Vista, so they would be a good pick if you're looking to add more tuners to an MCE system.
Press Release [ATI]