Robots.txt Secrets From Matt Cutts
The secrets in this post were really more of enlightening bits of seo wisdom. The secret is how to combine robots.txt with meta robots tags to control pagerank, juice, whatever.
SEO with Robots.txt
Very nice tutorial dealing with the robots.txt file. Shows examples for google and other search engines. Wordpress robots.txt and phpBB robots.txt sample files.Rewrite underscores to hyphens for SEO URL
Replace underscores in URLs with hyphens using Apache .htaccess.