Ten Tips to the Top of Google - see item #7. <http://www.searchenginewatch.com/searchday/article.php/2198931>
Design & Search Engine Optimisation - see item #2.
http://www.abakus-internet-marketing.de/en/seo-tutorial/design.htm
Search Engine Marketing 101: What Search Engines See When They Visit Your Web Site http://www.searchengineworkshops.com/articles/SEO101.html
Some search-engine related articles supporting “clear links”:
http://www.bigmouthmedia.com/search_engine_information/optimisation_accessibility/