There are a number of websites that allow you to value your website but how accurate are these. Here are the results for some of these from my http://programmershelp.co.uk domain name. This is a 7 year old, page rank 4, alexa ranked and is also in dmoz amongst other things.
http://www.yourwebsitevalue.com : $7776
http://www.cubestat.com/ : $5810
http://www.dnscoop.com/ : [...]
