One of my coworkers took me out for a ride a few weeks ago, and we went to the parking lots to the northeast of RFK Stadium.
Now, it wasn't a complete surprise to me -- I was down here way back in '02 on a jog a day or two before the race itself. But, the 1.68-mile course is still marked even though the grandstands are long gone. It makes for a somewhat entertaining bike ride with a variety of corners, decently long straights, and remarkably consistent pavement quality (as it should be, since it's still used for parking and hasn't been completely abandoned).
I may take some pics someday, but there really isn't very much to see on course. The curbing is still there on some of the corners, too.
Spectator video (amateurish, but you get the idea):
Google Maps (complete with a six-car Metro train on the bridge and the not-yet-worn Cadillac script on the southernmost turn ):
Anyway, thought some of you might find it interesting.