People seem very Anglofile here talking almost exclusively about BA, forgetting that AF also flies Concorde. And as one of you has already noted, DL's program has an award on this service. However, as a NW WorldPerks member, you will have to wait a while until it formally joins the SKYTEAM alliance in the new year. Then you will be able to use your points from NW's program for awards on AF.
Having now flown Concorde round trip twice -- once through the aforementioned SPG-->QF conversion deal, another on a purchased ticket -- I am sure you will enjoy the experience that I personally believe anyone considering him or her self a true FFer, needs to have. While many complain about how cramped Concorde is, or how the meal didn't live up to their expectations, it is a unique experience and that is the reason for flying it. Good luck, tc fly girl, your patience should be rewarded by WorldPerks some time in 2003. Save your Marriott points for a nice stay at one of their Paris luxury properties to heighten the overall effect of the trip.