Well All i know if for some things it is popular. I don't know about any other ones paying more, but you can make a pritty penny of of google with this. What are your veiws about Google's Adsence?
For all the hype that I hear about google Ad-sense, I have some real issues with them. First, they give alot of hype to matching their content with your website, but when I put them on my site, all I got were Public Service Announcements. This is the VERY VERY last thing I want appearing on a job board.