SUP (Simple Update Protocol) is a simple and compact “ping feed” that web services can produce in order to alert the consumers of their feeds when a feed has been updated. This reduces update latency and improves efficiency by eliminating the need for frequent polling.
Latest Updates: update RSS
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simpleupdateprotocol - Google Code
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Mastering Your WordPress 2.7 Theme & Admin Area: Tips and Tricks
“This post will highlight WordPress 2.7 HOW-TO get your theme working again by updating some settings and represent some of the best and significant features added to your Administration Panel.”