Eric Schupps a SharePoint MVP from Binary Wave, and a Colligo partner, posted a good article how to drive SharePoint adoption:
http://www.binarywave.com/blogs/eshupps/Lists/Posts/Post.aspx?ID=174 .
As a #4 for Eric’s list, I would add that companies should consider quality 3rd party products, such as Colligo, to improve the user experience. 
