Babylon-x pays 3c, but there are no online signup form, just write Traci at
[email protected] and ask her to let you join.
Another one i know is offshoreclicks. You can sign up here
http://php.offshoreclicks.com/cgi-bin/ref.cgi?win
They pays for blind links, even for showing their console.
But remember: with per-signup and parthnership spons you can earn alot more