Seems to me that NVIDIA is going to confuse the market right into ATI's hands. Stores like Best Buy never get rid of their old stock, so picture a shelf with 32MB GF2 MXs, 64MB GF2 MX400s, GF2 GTS-Vs, GF2 TI 200s, GF3 TI 200s, GF3 TI 500s and now all GF4 derivatives....ugh.
The only reason I can think for all of this saturation is that NVIDIA is still having a horrible time producing GF3 cores and wants to move on quickly to the GF4, even if the products overlap in price, performance AND shelf space.