I was searching for a tool that could really find the value of any blog/site. In the begining i found two-three tools but i wasnt impressed because more the tools, more are the reports and you can calculate a better average of your blog worth. But after searching for 3 weeks or so i prepared a list of wonderful tools that could find how much is a site valued just by entering Url of your site. These tools calculate your website value based on no. of aspects like :
->No. of backlinks to your site.
->Rank of your site.
->No. of visitors, etc.
->Age of domain name.
I cant tell how much you can trust these tools but they would really give you satisfaction that all that you have done for your site/blog is being added to the blog value.

Here is the list :
Business-oppurtunities
Your-website-value
Website-value-calculator
Smartpagerank
Cwire
Site-value-calculator
Estibot
Dnscoop

reputation monitoring made easy
Enjoy calculating :)