other six sigma…please read this

David, Welcome!
Wow, that’s a big question.  Six Sigma is used extensively by many, many companies (and many governmental and non-profit groups, too).  One really good starting place:  Michael Marx’s “Six Sigma Companies” blog.  He has dozens and dozens of companies noted.  Try this link: http://www.sixsigmacompanies.com/
— QualityColorado

orang_utan, Regarding your note:  I hope that my posting was not construed as promoting a website for commercial purposes.  If you go to iSixSigma’s Blog-o-Sphere (http://blogs.isixsigma.com/), you will find that Michael Marx’s Six Sigma Companies blog (http://www.sixsigmacompanies.com/) is one of the featured blogs (see the listing of blogs on the left side of the Blog-o-Sphere page).  It has a lot of terrific information!!
By the way, there are also several other very good iSixSigma.com blogs that may help our original poster with his project, including Michael Cyger’s blog (http://blogs.isixsigma.com/index.asp?ui=Michael%20Cyger&s=bloggers) and Gianna Clark’s blog (http://blogs.isixsigma.com/index.asp?ui=Gianna%20Clark&s=bloggers).
I don’t believe you will find any commercialism in these excellent blogs. 
I hope that this is useful to you.
Best regards,
QualityColorado