SEO Egghead has compiled 21 top SEO tips given by Matt Cutts over the last year. The concise list includes links to all the tips by Matt Cutts on the subject of SEO in Google. According to Matt Cutts the tips will help you rank better.
The list of the links also include a summary which is a time saver. Some of the the tips are :
Matt recommends using dashes over underscores to delimit words in urls. 2005. Google does not algorithmically penalize for dashes in the url despite the fact that some have raised it as a possible heuristic for spam detection. I think WordPress pretty much precludes this anyway. 2005.
Google updates their index data — including backlinks and PageRank all the time. However, they export and publish new backlinks and PageRank data approximately every three months. New backlinks and PageRank are meaningless — it is not an update. The information is likely already factored in for awhile before you see it. 2005.
Google’s is against selling/buying links, and Matt indicates they are good at spotting them — both algorithmically and manually. Sites that sell links can lose their trust in search engines. 2006.
External (domainA -> domainB) 302 redirects are largely treated as 301s now. 2006.
Matt Cutts corrected this (number 17 in the list) advising to "use a 302 for temporary moves, and if a move is permanent, use a 301."Quick Fix : 21 SEO Tips from Google's Matt Cutts,