Typically AMD will bring out a chipset to support its new CPU's, until third party solutions are market ready; they brought out the 750 irongate, 760, 760MPX, and now for K8 they also have all the neccessary chips.
Mostly AMD's chipsets are just pretty crude, basic chipsets, that work allright, but nothing much more. Rarely top performing, nor very feature rich. The main reason however, they do not invest in developping state of the art chipsets is not that they wouldnt be able to, its that they do not wish to compete with their chipset partners (like VIA, nVidia, SiS,..). Intel really pisses those companies off by heavily competing with them, even asking a "tax" per chipset.
You can afford to do that when you've got intels marketshare, since there is still money to be made in spite of the tax, and the competition by intel, but if AMD where to try that, those companies would just give AMD the middlefinger, and ignore the AMD market. So, unlike Intel, AMD actually tries to help those companies making a buck in the chipsetmarket, which in turn leads to better support, more competition and wider choice of chipset solutions for their cpu platform even though its just a small market compared to the intel chipset market. Don't foget, only a few years ago it was questionable *anyone* would invest in an AMD only chipset. With only 15-20% of the market, AMD can't afford intel's policy. I think they are doing the smart thing here, even if it has (had) its major downsides as well.
= The views stated herein are my personal views, and not necessarily the views of my wife. =