What are the best Google ad sense alternatives?

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As you may be aware Google has been suspending too many accounts with/without proper reasons lately. Besides it's a bit difficult to get your new Google ad sense application approved these days people say. So, it's obvious we need good alternatives for Google ad sense ads. There are many ads networks out there such as Chitika, Clicksor, Bidvertiser, Infolinks, Kontera, Yahoo and Adbrite. What are the best Google ad sense alternatives? Can you share your experiences with me here? thanks...