The SearchForecast ‘Directory of AdSense Publishers’ now has 350,000 AdSense Publishers inlcuded. Correct me if I’m wrong but I do believe its the largest in the world and with Google getting 35% of their revenues ($5.78 Billion) from AdSense in 2007, its important to understand who these publishers are.
Search and browse the directory at http://www.searchforecast.com/directory/index.php. Website Publishers can also now add a description, photo or video to their directory listing!