Well, in the Apple store, you have an option of either
a) Radeon 32MB
or
b) Geforce2MX 32MB
with no difference in price between a) and b) or
c) a downgrade to ATI Rage 128 for less $
back at the last MacWorld, ATI let slip details of the new Macs to the public, so Apple punished ATI by removing their flagship (at the time) RADEON card from the presentation Mac, and not even mentioning it once.
Since then Apple has been exploring NVidia products, and it's pretty funny that the bottom of the barrel GF2MX is on par or better than the ATI.
I just hope that Nvidia doesn't stagnate once it destroys ATI, and becomes ATI, with horrible drivers, and just a plain SUCK company.
Down the road, Nvidia will probably have more Mac cards, but I doubt there will be much if any at all retail presence in the Mac market. With the great PC retail market and a nice OEM piece from Apple, things look great for NVidia