Your best bet would be to list it on Ebay for a quick sale, though I would not expect to receive more than mid $XXX for it.
Listing it on Afternic or Sedo, might get you a better price but it's going to require Patience.
What is the name anyway?.
The marketplace forum here is good for quick sales, if it is priced aggressively.
ebay is fine and all, but it's a complete hit or miss typically. And it's not quite as "fast" as private listings here (Which are free, by the way ).
-Allan :gl:
I'm not pushing my own site, but I do have a fully functional, all singing and dancing auction site for domains which is unused.
Pm me if anyone wants to take it on and run it.