Used

Edmunds.com: Used BMW Vehicles
Reviews, ratings, and vehicle information on used models produced in the past ten years.
http://www.edmunds.com/used/bmw/

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

New Car Test Drive: BMW - Past Reviews
Archive of reviews of BMW vehicles from 1995 to the current model year.
http://www.newcartestdrive.com/review-year.cfm?Make=BMW

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