Whitepapers have been a great marketing tool for gaining industry credibility, relevant leads, and more traffic to your website.  Even though there are probably thousands of Internet Marketing Whitepapers out there, there are a select bunch that are know for creating industry-recognized, high-quality whitepapers.

Click the images to view their whitepaper area.

Hubspot

WordStream

OneUpWeb

Search Marketing Now

Enquiro

iProspect

SEOmoz

Unica

More Visibility

Omniture

ClickZ

Lyris

Standard Marketing Standard

Search Engine Watch

MarketingProfs


http://www.iprospect.com/about/searchenginemarketingwhitepapers.htm