I've been with Google Adsense for over 2 years and think they are the best. I've recently just joined AdBrite as well, though I don't make nearly as much with them yet. And yes you CAN have Adsense and other ads on the same page as long as the other ads are different enough so that they can't be confused with the Adsense ones. I've already confirmed this with Google on several occasions. You can also include other people's adsense code as long as there's mutual consent.