The clickbank loophole is interesting -- but they don't support 2-tier structure.

Here's a nice comparison I found between two diff programs.

http://www.top2compared.com/affiliate-software/

Btw, the page struck me as a good way to market something.

Like a 'review' site, only more direct.

I think the page looks nice + definitely makes the point from a 'third party' point of view.

-- TW