Great Post on Google Local SEO Tactic
SEOmoz came out with a great post on how to go through the Google Local results of competitors to find directories that are being used by the algorithm to rank businesses. Of particular note is the importance placed on perfect consistency from one listing to another. The general idea is that by looking through the reviews on each business you can click through to the sites themselves and add your information too. At the very least you get some link-building done and at best reinforce your businesses credibility with Google. The post itself has screenshots and instructions. You should read the post and do what it says for your business. And, you should probably do it soon!