Adsense revenue......

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I know that there are several people here that have adsense accounts and I am wondering does anyone know of any secrets to improve your adsense revenue?!? I would like to increase my earnings with adsense and I am having a hard time doing it. I have a few different blogs and a website or two but I am still having a hell of a time with adsense. Any help or advice will be greatly appriciated!