there are a few pieces of software out there that aren't outputting anything past [content:encoded] tags from a wordpress rss2.0 feed
I found a fix for everyone
http://pixane.net/index.php/Wordpress_RSS
keep in mind, that if you are providing a rss feed for affiliates that is being created by wordpress, then anyone using rss2blog and a few other pieces of software CAN NOT use your feed, this will fix it
I have not personally tried this, but judging from the data I can see, it shoudl work