If you think you know everything about SEO on blogs, then take a look at this post at Performancing to get more insight from a Senior Google Engineer. It’s worth your time.
I think everyone should sit down with Google’s webmaster guidelines and just read it all. It will only take a couple hours, but the time is well worth it. Make sure you subscribe to the official search engine blogs. I have a lot of respect for Danny Sullivan, and there are some real experts at WMW and TW. If you’ve got any kind of coding experience, try to build a search engine yourself. You’d be amazed what you learn. Take random info out on the net with a grain of salt unless you know something about the poster’s credibility.