Personalized search, behavior-based search, intent-based search, and universal search will all effect search engine ranking in some fashion.
As an advanced warning to my clients and readers, here is a video interview with Bruce Clay that we all should pay close attention to and implement appropriate steps in future online marketing efforts.
Here is another interview video, this one with Matt Cutts as a follow-up to the above.
Buzz & Social Media Marketing will have a much greater impact on your success in the future so get out that video camera and post to YouTube, participate in online communities & start podcasting. Also paying attention to more in-depth analytics will be required to truly measure your Web properties performance.