CyberWyre has developed a tool to evaluate the value of a website based on the site’s Alexa Ranking, Page Rank, Backlinks (from Yahoo, ATW and Altavista). It provides a rough estimate on the value of your site. It’s pretty much similar to the ‘How much is your blog worth’ tool based on the Technorati’s API, but throws up a different result. CyberWire tool indexes the site based on multiple params. and not just one factor like in the technorati tool.
It also shows an estimate of how much you can probably earn by Text Link Advertising, Affiliate Marketing etc..Check out Website Value Calculator


You should also take a look at http://www.websitefact.com ; I found it very useful in terms of a website performance. It has some good info on there.
1