Used

Edmunds.com: Used Audi Vehicles
Reviews, data, and pricing information on used Audi vehicles.
http://www.edmunds.com/used/audi/

Epinions: Used Audi
Opinions of used Audi models written by consumers.
http://www.epinions.com/Used_Cars--reviews--audi

New Car Test Drive: Audi Review Archive
Archive of reviews of used Audi vehicles from 1996 to current.
http://www.newcartestdrive.com/review-year.cfm?Make=Audi

Used Audis - AOL Autos
Local used Audi cars and trucks for sale, ratings and reviews, vehicle information and comparisons.
http://autos.aol.com/used-list/make1-Audi