Link building expert Michael Gray dishes out a never-before revealed link building strategy:
In many cases it’s hard to build links to commercial pages where you are selling something, so some people create an informational page build links and then 301 it to commercial page later on. Why not avoid the middle step, instead of 301-ing the page later on put the commercial content on that URL and relocate the informational content to another URL. If you’re really clever you can get try and get links to the new URl as well.
Graywolf SEO Blog