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The ReadWriteWeb has some interesting picks for the most important RSS and Syndication Technologies of 2009.
Top 10 RSS & Syndication Technologies of 2009 [readwriteweb.com]
- Echo, from JS-Kit
- PubSubHubbub (and RSSCloud)
- Tweetdeck (and Seesmic)
- The Breaking News Online iPhone App
I'd add FeedDemon. Their switch this year from a NewsGator back end to Google Reader has improved syndication and allows for collaborative use of your feeds.