
Revenue is typically split 75/25 in your favor. Through a small piece of HTML placed on your site, handle the serving, scheduling, billing, customer service and sales. About half of Adbrite sales are generated from the marketplace and sales team, while the other half is generated by users clicking "Your Ad Here" on your website.
While Adbrite can provide publishers with more revenue and better ads than traditional ad networks like Google AdSense, they work fine along side them as a way for you to generate additional ad revenue by selling ads directly to your visitors - something the other ad systems do not. Ad Brite, you can also choose your own minimum prices and allows you to display an alternative ad service as Clicksor when the bid falls below your minimum.
If you use Adbrite on your site, you also have the option to turn off Adbrite's "run-of-ads" and Adbrite will only display ads that are authorized by you so you can prevent competitors ads from showing on your site. If you have no ads, Adbrite show anything but "Your Ad Here" or your alternate ad provider.
Note from my experience, it can take a day or so from when you sign up with Adbrite and put their code on your website to actually start seeing relevant ads show up. So if you see the "advertise on this site" just be patient and give it a day or so and you should begin to see relevant ads show up.

Adbrite also accepts blogs and bloggers as places, so if you're tired of other programs turn you down because their terms and conditions restrict Blogs try Adbrite.