Hi Mark,
First of all, there is no 100% foolproof method of appraising a domain name. In my view it comes down to what the market will pay. For example, some people may want it for the traffic, but others might want to use it as a brand. As such, they may have completely different ideas as to what its worth.
Some people on DNF will use estibot to give them a quick overview. If you feel like a good read, check out the appraisals section in the Domainer Income Wiki (in my signature). It will give you a more detailed explanation of appraisals.
If you think you might have a good name then post it in the relevant forum and let the market give you a realistic opinion as to what its worth. You don't have to list it for sale - just ask what its worth. If you are not comfortable with releasing it publicly, then consider sending a few people a PM.
I hope this helps.
Simon |