If you want to try something new and unique, checkout my site TextAdMarket (in sig). You setup your ad and choose a "price per day". Assuming advertisers want to advertise on your site, you will get the same flat amount each day, rather than fighting for clicks, impressions, or actions. I don't like sites like MegaClick where they don't immediately show you the ads for sale. Like this: http://www.textadmarket.com/buy.php
I really think this is the future of advertising. Adtoll.com, and Technorati Engage also do this. For publishers it allows you to build direct relationships with advertisers, and for advertisers you know exactly what you are going to get. The only downside for these type of ad networks is that it is to easy for both publishers and advertisers to cut out the middle man (you) and do business on their own, thanks to communities like DP.
megaclick mega company (no idea what there main company is) is going into every hot market! I like megaclick lets see when it comes out