So far, only AOL and Amazon. I think Gammacash (or moneytree? I couldn't be sure, because I quit them both already) is another one, but I am not sure. I mean their pay per click program. I did a test by clicking on that banner myself on three different locations, but they totally recorded 2 on that day!!!
DTI is almost the best I know so far. They paid 75 just to sign up.
Here is a link to one of their site, <a href="http://click.dtiserv2.com/Click/593-113-ch245">DX Live</a> you can log in to find the webmaster section to join.
But, does anybody here really know about Amazon? I think we should form a class suit or something. :-)