Brett over at Copy Brighter wrote a very cool post detailing the 7 SEO techniques that Google smashed in 2007. In the article, he discusses these 7 techniques that Google has rendered obsolete. You'll have to read the article for the specifics, but Brett writes that they are: reciprocal links, the site: -sfkdhfjd command for supplemental results, directory links, open link brokers/networks, using subdomains to own the SERPs, sponsored blog post networks, and 10 blue links (as replaced by universal search).
What's missing from the list? Over at Sphinn, we learn that there's more techniques that Google smashed and other noteworthy changes for 2007:
Kalena Jordan mentions that associating a domain with region/country via Webmaster Tools is a noteworthy change for the year.
Ian noticed that Google resolved the 302 redirect issues and focused on filtering out duplicate content.
What else has changed for us in 2007? Forum discussion continues at Sphinn.