From ProBlogger:
1. Create link clusters within your blog
A link cluster is a group of links that you can point at a post or page to improve its search engine ranking. Let’s say you have a post that’s ranked for ’stupid business ideas’. Edit 10 of your other posts to create links (using ’stupid business ideas’ as the anchor text) to the ’stupid business ideas’ post and you will surely move up in Google for that keyword. This process can be implemented in about 10 minutes and can be used for any keyword your site ranks for or is trying to rank for.
