Matt Cutts' blog is the first place I look for any Google seo related issues (he's head of Google's webspam team).

Matt talks about the anatomy of a search result, and gives some useful tips on how you can help improve how your site appears in our results pages. This talk covers everything you'll see in a search result, including page title, page description, and sitelinks, and explains those other elements that can appear, such as stock quotes, cached pages links, and more.