This is from
http://www.pat-burt.com/domain-names...in-name-worth/
"So Really, What is my Domain Name Worth?
Simple answer. A Domain Name is worth as much as someone is willing to pay for it. I compiled a list of resources where you can look through Domain Names on sale and get a general idea of what they’re going for. In the event of auction sites, it’s best to only pay attention to sites with bids on them."