There is so much evidence proving the lies of these men. I will point you to two key websites that have done a lot of work to uncover the true story behind the swift boat vets for truth.
First Media Matters.
This article shows that 22 of 24 newspaper editorial sections say that the swiftboat claims have no merit. If you have time there is a lot of good stuff in there about specific lies.
http://mediamatters.org/items/200408260009Another link
http://www.factcheck.org/article.aspx?docid=231and another
http://www.factcheck.org/MiscReports.aspx?docid=245 
