Google Study Web Page Design:

This has to be the most fascinating review of page design to come along in years. Google analyzed 1,000,000,000 documents crawled in December 2005. They break down the data into easy-to-read sections and drop a few confirming remarks about which elements and attributes Web site designers should and should not be using, both for search engines and compliance with future standards-strict clients (including browsers).

(Via Threadwatch.org.)