we have estimated that $500 million has been generated within the top 50k blogs in 2006.

These guys are making Millions blogging! How much have we made????? LOL 

http://chitika.com/blog/?p=253

Chitika has taken the first step to estimate the revenue in the blogosphere. In our Blog Dollars Study we have estimated that $500 million has been generated within the top 50k blogs in 2006.

Jump in on the active discussion now on TechCrunch, your feedback is highly encouraged!

This study was done as the first of more to come in the future. We will continue to update the revenue in the blogosphere using richer data.