Here are a few interesting domains I've collected over the years. These aren't new domains, and they do have established sites on them right now.
GoldFiles.com -downloading site
TheBraceletBox.com -jewelry site
TheDDN.com (i use it for TheDigitalDownloadNetwork)
LOLAlbum.com -funny pictures site like YouTube
I'm not sure how much they are worth, but I bet GameAracde.org and the Insurance-Quote.tv would be worth the most. I researched the highest paid google adwords, and the keyword "Insurance Quote" was like $18 - $35 per click on google adwords. That is a killer domain IMO. What do you guys/gals think?