I have always blocked all "sensitive categories" in AdSense (why Ringtones and Downloadables are "sensitive" is beyond me). Recently G added the "Gambling & Betting" category which I allowed (although no impressions yet) thinking eCPM would climb. I then re-visited each one and found 2 that would fit (slightly) my sites subject matter. Do you think, or have any experience with allowing them as far as eCPM is concerned?