RSS has been kicking around for a while now, but everybody still seems to have their own take on it - as with most web standards most of the fields are optional, with that in mind a minimal RSS viewer would need to support the following mandatory fields:
title- name of the article
link - URI pointer to the article
description - a short summary or description of the article
Everything else is optional; concepts such as ttl, rating and category are rarely used, whereas pubDate and image are quite common.
A full spec for RSS 2.0 is hosted by Harvard University : [view]
Considering that both Firefox, IE and Outlook can render RSS it should be sufficient, in the minimal case, to present the user with a list of links to RSS Feeds and let the browser manage the presentation.
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