Thanks for the info on CPA networks.
On a somewhat related note (advertising, but not CPA), I'm keeping an eye on the ScribeFire QuickAds program, which is in closed beta at present. ScribeFire is a blog editor plug-in for Firefox; their QuickAds program would allow just about any blogger to sign up to display their ads, which would be drawn from 100 ad networks, including Adsense. ScribeFire says that payouts will occur once a month, with no minimum threshhold for payment. It'll be interesting to see how this QuickAds idea plays out.
I find that I'm using ScribeFire more and more for writing blog posts, and that it saves me a lot of time. When the collaborative site flipping project gets under way (https://siteflipu.com/work-work-work-updates/
), I may add a post about using ScribeFire.
I seem to be moving further and further off-topic with each paragraph, so anyway, thanks again for the CPA tip!