Given the situation with Smowtion (...) I have been using Adbrite for some time but earnings are not good. They don't pay by PayPal either.
Adversal might be an option, but according to their terms they require 50% or greater North-American traffic.
I was rejected twice by xTendia, and they didn't reply when I asked for reasons. However, some people have managed to get in with proxies.
So, in essence, I am also looking for better means of advertising on the proxified pages without resorting to surveys (e.g. CPA Lead).