I am having a webdesigning related website with good traffic,,, i don't have adsense and i don't like to use other networks like adbrite,,, i like to work with big companies like tribalfusion,doubleclick,,, i like to know more big companies like tribalfusion and doubleclick,,,
AFAIk,those big company does not accept small client. You need an introduction people to help you gain a place in their publisher network.