Go to adbrite.com/mb/landing_both.php?spid=50712&afb=125x125-1 and register as an advertiser. Then, setup your campaign for the interrestial (which is basically a full page inline popup). Now, here's the beauty of it. Set the cost of each interrestial to cost you $0.001 per interrestial popup. Now, since you've made it to this step, you've already told them the parameters that you want it to popup your ad (tech sites, health and beauty or whatever). So now, you're getting targeted visitors to your site at the rate of $1 per 1000! Woot! Have fun!