Get .edu free backlink with PR4 http://mysiteevaluate.com/backlinks-blog/42/edu-free-backlink-with-pr4/
err in his defence Code: http://bioimagesuite.research.yale.edu/forum/index.php is a valid PR4 I checked multiple sources with US based IPs- grip load of ads on the post though mate, even hard to read cause of it. However the method isnt going to give you a PR4 link, but a link on a page thats linked to by a PR4 page, and it won't be linked to by the PR4 link for long. As soon as your username falls off the home page its done. Course I suppose you could do this with all the top forums and then just make a dedicated box that sits around and refreshes the home page every so often with you logged in and hope G crawls the site while your logged in. I digress....
