We use blogs organizer with the affiliate mod plugin for our rss feeds. We make a blog post and it makes the rss feed.

Here is our AcesBedroom Blog: http://www.acesbedroom.com/blogs/?aff=XXXXXXX

And you can find the rss feed link page on the right hand side of that page.

Affiliates can link to our hosted blog with their code or can import the rss feed with their affiliate code.

Jimmy