I found this list on the web when I was looking for ways to optimise my site, as normal I was sceptical to start off with but all these services have page rank of at least 5, so I thought may as well sign up. So far I have signed up for three of these sites and have doubled my ad sense revenue, it's crazy, it really works. To be honest so far it is the best list I have found compiled on the web for ad-sense purposes a 100% increase and the change was instant, I found Clipmarks particually good and a good source of traffic and adsense clicks. I will leave a link to the page below and full credit to the author.
Ad-sense promotion campaign list