Matt Cutts just released this video a couple of days ago. It includes a number of sites that people have recommended to Matt for an SEO optimization. Pretty good stuff. What I really found interesting was his review of the WordPress site that was hit by a virus. Since I recently had to deal with this issue myself, I found his analysis and recommendations very apropos and note worthy to other WordPress users.
Note: UPDATE YOUR WORDPRESS!!!! If it isn’t up to the current stable release of 2.9.2. That’s the first step.