I typed "7800" into Thunderbird's search filter to see how many sites published a GTX 512 article today. Sufficient to say I nearly cried. So here goes nothing...
HEXUS.net - Well worth a read... includes badger references.
Techware Labs
Adrenaline Vault
Digit-Life
Guru3D
Legion Hardware
PC Perspective
Willy Wavey Dave's Beyond3D
AMDZone
Bjorn3D
Tech Report
HotHardware
Hardocp
Tom's Hardware Guide
Anandtech