I keep a list of private services on my web site that assist for passport and visa services, including expedited service. I don't know any of these personally, so buyer beware:

http://www.americanpassport.com/
http://www.expressvisa.com/
http://www.passportsandvisas.com/
http://www.passportexpress.com/

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Michael Steinberg
Editor
BizTrip
www.biztrip.com