I have a couple ranking friend's pages (tweaked versions of the normal toplist).
I send the traffic from my paysites. Sure, the numbers aren't amazing but it's honest and not pop-up hell. You'll need an image 150 pixels high and 100 pixels wide to display on the page.
Check it out at
http://www.pornaddict.com/friends
Look forward to any honest trades.
- PornAddict