You have to use everything at your disposal my friend.
sitepoint, here (wickedfire) dnforum, namepros(a total bitch but it works.)
The key thing is knowing what to sell on which forum
sitepoint - it has a very very wide variety of buyers and you will sell a total b.s site on there
wickedfire - If you want to mint money here, find out what niches are popular and sell premium .com domains in that niche - you will walk away with a bundle. Most of the audience here is ppc oriented and wont mind buying
www.--webhosting--makesmemoney.com to get high ctrs.
Dnforum - They will rape you trying to get your domains cheap. I think the best you can do here is with typos. They fucking love them. Heres a tip, check out their domains with uniques above 30 - bro you will find some gems you can develop overnight.
Namepros - one of the ugliest domain websites i have seen. Totally fugly (fucking ugly)i cant even navigate that place to buy or sell something decent. I think you have to be a aerospace engineer to figure out that website.
Those are your top websites yo can sell.
Oh shit i forgot, ebay is another but use that to drive traffic back to your auctions - the worst that can happen is your auction gets cancelled.
