Wikipedia: Worth Gold

Wikipedia Review 

What does this tool do: Gives your site an excellent heavy-weight backlink.

Cost: Free

Who Needs It:  Want to increase your page rank overnight?

Info Page:   http://en.wikipedia.org/wiki/Main_Page

Comments:  

Wikipedia, a user edited encyclopedia, has a PR (Page Rank) of eight. If you can get a link to your site via Wikipedia, you will gain instant credibility. But Wikipedia is monitored by people who make biased decisions about content, so your script addition or link must be weighty, scholarly and essentially non-commercial.  If you can swing this, and have a topic that lends itself to encyclopedic or historic explanation, then have a go at it. Make dead certain that you fully understand the rules before attempting to change content however.