Hmm, wouldn't this be better in the 'domain developement' forum?
Anyway, here are some links I've bookmarked that uses your domains:
http://www.trafficsupport.com/parking.html http://www.trafficz.com/ http://www.namerenters.com/
Those are all I've come across so far, I'll post more if I dig up anymore. I don't know how much they pay though, since I haven't used them, though I'm sure some members here have. Hope this helps.
<<EDIT>>
found some more
http://www.sedo.us/services/parking.php3?language=us http://www.targetwords.com - has a program for domain parking pages