Detect rel="nofollow" Link Lists, Free Tool
 

Free tool for easy detection of Link Lists that use rel="nofollow" tags for listed free sites or list them through scripts to prevent free site from getting PageRank or backlinks...

Use it freely and spread the word :)
rank1porn.com/rip-off-link-lists.html

http://tools.seobook.com/firefox/seo-for-firefox.html

Firefox plugin, shows all links with nofollow on a page you visit with red background

how about a tool to increase traffic?