Which is the best advertising program?Google adsense, adbrite,or something else?

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Hello, I wanted to know about your experiences with these sites. Which is the best advertising program site which pays on time? I've tried google adsense, but then, there is some problem going on with my account there. So which is the next best program, which pays? I've also heard of bidvertiser. What's it? And if you know about any other advertising sites also, please tell me. And one more question-- can we publish ads on our sites from two advertisers? Like can we use both adsense and adbrite advertisements together on our site?