I've put together a slide presentation that explains the differences between three types of RSS feed:
Each of these types of feed have their advantages and disadvantages; the non-profit organization should carefully strategize before selecting the type to use.
Incidently, many are considering the personalized RSS feed as an alternative to personalized eNewsletters. Studies are showing that 30-40% of opt-in eNewsletters are not being opened and read. Spam and over-filled email boxes are to blame.
On the same site, I provide a working prototype of a simple, personalized feed. In this demonstration, we collect name and email address and the feed then carries a unique ID that ties back to those identity items.
Go to: http://www.boadminsys.com/rss for the demos.
Ward Bell