i did some research myself, and found few good websites for such purpose... GoDaddy Auctions NameJet DomCop Sedo.com SpamZilla.com DomainhunterGatherer ExpiredDomains.net but i haven't used them personally, i have gathered this information from various blogs. but still not sure which one works good... so any experienced one can rate them; would be very easy for all newbies like me...
I list my domains on Afternic, Sedo, Dan and GoDaddy auctions I once sold a domain for $600 on GoDaddy auctions, and sold two domains on Dan for $250, and only one domain on Afternic for $120 I suggest that you list all your domains on all these marketplaces to sell at retail price.. and if you need to liquidate fast.. I suggest to sell at Namepros forum.. if you want wholesale price