I have read quite a few times that once a site becomes "big", you can deal directly with "premium advertisers" and make a lot more money than with AdSense. I have one tech site that is finally averaging over 17k unique visitors a day, around 100k page views a day, and has an Alexa rating under 20k. If anyone is in the business of selling premium ad space, I would appreciate a PM. I would like to outsource this function to a professional. Please expect to provide references from current clients. Thanks!