but you are putting your adsense accounts at risk if you participate in bad forums. becareful of that
It would be nice if there was decent free money to be had this way but things aren't nearly as good as they used to be - the finances don't stack up if you look at the time spent.....
Yes, revenue sharing is nice when surfing places you already spend a lot of time, but as someone else mentioned, it is better to build out properties on hubpages or squidoo, where the adsense income is tied to your articles ,not to you being there. I have a couple really popular lenses on Squidoo that get me more than a few dollars a month - of course I give it away to charity, as the lenses do more to drive traffic to my money sites.