AZB - yes, based on the kinds of WUs developed. In the future they are suppose to be just about the same.
Oh ok. I was scratching my head a bit on this one - for gaming, the new 48x0 cards seem real close to the 9800GT and 260GTX line, which implies they have close "power" but their PPD is far apart, which is confusing. I guess it can be explained by the fact that both companies have only just recently (in ATI/AMD's case, like a month ago) released official support of GPGPU or whatever they're calling it. Drivers and support should only improve over time from each maker and like you said, it should stand to reason that they'll get closer in PPD.