After the the problems I had with the ATI TV Blunder and then the 9600 AIW back in the day I am not surprised about the 650 having problems with Win 7. I am in the market for a HD card since my old PVR 150 doesn't like Windows 64 bit and 4 gb of ram. I almost pulled the trigger on the ATI 650, but I came to my senses and did some research and was glad I did not buy it. You would think a card that is still being sold would have Win 7 drivers for it.
Well I went to MicroCenter a couple of days ago and bought a ATI TV Wonder HD 650 Dual Tuner card and it works. It is by Diamond and is in a newer box than the other Diamond ATI tv cards there. I bought it because it lists Windows 7 as supported. At $50 it was worth a shot, and if it did not work I could have just taken it back. There is no remote, but that is not really a problem for me.
I use Windows Media Center and it works fine. The first day the local hd channels were really choppy and full of artifacts, but when I tried the next day they were fine. I don't why, but as long as it works I am happy. So it is a keeper for me.
Jim