Feed References

Free Lightweight RSS (2.0, 1.0, 0.9x) and Atom feed aggregator extension for Mozilla Firefox. (Free)

A free Internet Explorer add-on for reading RSS feeds.

FEED Validator - (Rss 1.0, Rss 2.0, Atom 0.3)

RSS Validator

Give a good introduction to RSS feed which should help newcomers answer the what, why, when, who questions about RSS.

Another good tutorial which explains most of the terms related to a feed.

A excellent reference website where you can find everything you want to know about RSS feed, from creation to publishing.

NewsGator - the news aggregator for Outlook

Offer many free and original services for webmaster who want to optimize their feeds.

The first place you should go for searching feed on the web.

Lightweight feed search engine with relevant results.

New feed search engine (Beta version)

News Feed search engine

Huge feed directory with many search options

A feed directory which contains any type of feeds.

Feed directory with an original search interface which groups results by category

Directory, software and articles about feeds.

Complete online RSS feeds directory