I know that this isn't the world's most powerful graphics card, but if like me you've only got a weedy 350W PSU in your PC then this is a pretty good card as it doesn't need any extra power connectors and it is fanless so it would also be handy for media centre PC. Particularily as it has a HDMI output as well as the usual VGA and DVI-I outputs. Also it can be overclocked and comes with software that will allow you to do it safely as well.
I bought one myself and fitted it to a PC with a Intel Core2 Duo E7400 @ 2.80GHz, 2GB Memory, Windows XP and it runs PC games pretty well. In fact it will even run Crysis at the Medium settings, although admittedly I'm only using it on a 15" monitor at 1024x768!http://www.gigabyte.com.tw/Products/VGA/Products_Spec.aspx?ClassValue=VGA&ProductID=2925&ProductName=GV-R455D3-512I