RSS 2.0 specifications
According to Dave Winer and Harvard
According to W3C
Some comments on the relationship between the two.

The many histories of RSS
A balanced view.
According to Wikipedia.
The RSS Advisory Board version.
The RSS advisory board.
Thoughts by Dave Winer on the RSS advisory board.

Finding RSS feeds
Great set of RSS information.
Search RSS.
A list of search engines that return RSS.
Syndic8 catalog of RSS.
Directories of RSS feeds.

RSS readers
Up-to-date reviews, all platforms.
Omea Reader (Windows).
Newsgator RSS readers.