I have good news! I just came across this Widget called "How Much Is Your Blog Worth?" developed by Dane Carlson using Technorati's API. The applet used gives the value of your blog in dollars using a link to dollar ratio.
I tried finding out my own blog's worth and got values of more than $1000 and $2000 respectively for two of my blogs. The site also provides the HTML for the widget that you can then proudly display on your site. Here is what they look like:
So, go on and find out How Much Is Your Blog Worth? Now! Just click on the link in one of the widgets above.