As of 2006, SAGE Electrochromics, Inc. is the only manufacturer in the U.S. selling electrochromic-coated glass units for building applications:

Lou Podbelski
SAGE Electrochromics, Inc.
One Sage Way
Faribault, MN 55021
(507) 331-4935
http://www.sage-ec.com/

SAGE's first market entry was to provide electrochromic coated glass to Velux for their switchable electrochromic skylight product line: electric venting skylights, fixed skylights, and fixed curb-mounted skylights in various rectangular sizes. They now market to a variety of window and curtain wall suppliers; contact SAGE for current supplier information.
http://www.veluxusa.com/

Other U.S. companies are also developing electrochromic window products but have not yet come out with a commercial product:

Dr. Thomas Guarr
Gentex Corporation
600 N. Centennial Street
Zeeland, MI 49464
(616) 772-1590 ext. 434

Mr. Jay Wolfington
Eclipse Energy Systems, Inc.
2345 Anvil Street North
St. Petersburg, FL 33710
(727) 344-7300 x206