PubSub, the matching engine and alert service that offers feeds of newsgroup and weblog content, is online this afternoon with a new real-time feed (delivered via RSS, email, or PubSub Sidebar) with up-to-the-minute earthquake information from around the globe. The content comes via a data stream provided by the United States Geological Survey. You can limit your alert feed to earthquakes that reach a certain magnitude and by region. PubSub offers a growing list of real-time alerts including U.S. airport delays, SEC EDGAR filings, and press releases from a variety of services.
I've also noticed that PubSub has plans to begin delivering alerts and other information via SMS (text messaging).