When I surf forums online, more and more I am seeing posts from people who say their sites have been banned from using Adsense; mind you, on checking some of the sites, I can’t say that I’m surprised. It’s always good to have an alternative up your sleeve - and, in such a huge marketplace, Google’s always going to have competition.
One source of traffic and revenue is

I have just tried a test campaign to promote a web site - and am certainly gaining traffic/clicks. I am in the process of testing headlines and copy to improve the conversion rate - but so far, I am content with what has happened. The next thing for me to do is to start selling some of my own advertising space using their network. That should bring additional revenue from sites which already have traffic.
This is one which is well worth testing out, IMHO.
Margaret
Footnote - I certainly recommend AdBrite