What firm design and implemented the US Mercedes-Benz "build your own" configurator?

Hi gilgamesh and thanks for the question.

The answer is: a company called 'Critical Mass'
http://www.criticalmass.com/medium/main.html

Contact:
US & International New Business
Heather Thomas
E: newbusiness@criticalmass.com
T: 312-466-8173 

Vendor Inquiries
E: alliances@criticalmass.com
T: 403-206-4356 

Media & Press Relations
Cat Hackman
E: cat@criticalmass.com
T: 403-206-4382 
http://www.criticalmass.com/medium/contact/contacts_0.html

Thnk you for the question.  Please donīt hesitate to rate the answer,
and if you need any other help regarding this question, just ask for a
clarification.
 
 
THX1138 


Search Strategy:
If we have a look at the source code for Mercedes-Benz USA, we see:
"<meta name="author" content="Critical Mass
(webmaster@criticalmass.com)">"

If we then look at www.criticalmass.com we see they list their clients
which includes Mercedes-Benz USA. Click on the MBUSA.com link and they
give us details of the work they carried out on the MBUSA.com website

Click on the second page and we see:
"This elegant, award-winning site sets the standard for automotive Web
sites. It's the site that launched the automotive industry's first
"Build Your Own" configurator - a tool that allows visitors to
customize Mercedes-Benz vehicles in real time."
http://www.criticalmass.com/medium/client/client_2_1.html