http://www.llrx.com/features/rss.htm
The Future of RSS – Is E-Mail Publishing Dead?
RSS-based Information And News Feeds: Pros and Cons For Content Distribution Through RSS
By Robin Good
Published September 29, 2003
Robin Good (Luigi Canali De Rossi) is the Editor of Sharewood Tidings, the alternative and independent news source on the effective use of new media technologies for online communication and learning. He is the author of several web guides, including Robin Good’s Mini-Guide, Become A NewsG-d.
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E-mail is a two-way communication medium while RSS is only a distribution one.
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To that, I would add that IM is email in real time.
This is still an excellent summary of the value of RSS. Or, distribution as opposed to communication.
Reinke Faces Life 