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Why keep polling a feed when you can be informed as soon as the information is available? One popular approach is to send the data over the Extensible Messaging and Presence Protocol (XMPP, aka Jabber), as is done by providers such as PubSub.com. There's even an Internet-Draft showing how to do it with Atom data (to which tthe various RSS flavors can be translated using simple XSLT): http://www.ietf.org/internet-drafts/draft-saintandre-atompub-notify-02.txt
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