Found this interesting examination of what is going on with SERPS and Google lately. The interesting point to the whole thing is that there is no definitive answer to whether or not traditional SEO is going to pot or not.
The results are mixed at best. Worse, the growth of personalized search keeps leading us to different conclusions. After all, if your site is of critical importance, having the SEO stick is a very big deal.
Clearly the best answer thus far seems to be to simply continue posting the best stuff possible. Obviously this is not always a winner, but most people need to stop obsessing over SEO and just write instead.