Matt Cutts, Greg Grothaus, Evan Roseman from Google explain best practices of SEO using examples of websites people have submitted.
Explanation from Youtube.
"A perfect opportunity to get your website reviewed by the experts in the Google Search Quality team. Attendees can get concrete search engine optimization (SEO) feedback on their own sites. We'll also answer real-life questions that affect developers when it comes to optimizing their websites for search. "
For all I/O 2010 sessions, please go to http://code.google.com/events/io/2010/sessions.html