Affiliate plugin - Use on non-MU site?

Is it possible to setup and use the Affiliates plugin on a non-MU site (running WordPress 3.1)?

I thought I saw on the plugin page that you could run it on a regular WP site.....

I have a custom theme that lets people write posts they pay for.

I''d like to implement a basic way to offer affiliate payments so they can advertise the site for me.

Please help!

Thanks!