Anand posted the first (to my knowledge) independent nForce review. The nForce appears to be an excellent all-around chipset, matching the VIA KT266A in all around performance when equipped with the Thunderbird (the KT266A, likely due to the lack of a chipset prefetch capability, appears to gain more performance from the jump to Palomino). Overall, this is a smashingly good job for a first try in the chipset market for nVidia, though the hype being generated far outpaced what we've seen here. Still, we can't ignore the possibility of nVidia making improvements to nForce performance, at the least with BIOS and driver updates.
Additionally, it should be noted that the nForce has several features, like prefetching and that dual channel memory subsystem, which are not found on the similarly performing KT266A. This evidences that VIA has room to grow its performance by adding features of that nature to their Socket A chipset lines.
It makes for a very good read, the article is 17 pages long so be prepared for a lengthy stay. Check it out here