EnviroMapper
EPA continues to impress with their EnviroMapper application. You can access a map by zip code or address that has all of the associated water dischargers, superfund sites, hazardous waste sites, toxic releases, air emissions, and BRS generators for the given area. It is very dynamic with the ability to drill down to various point-source data. Here's a nice online poster of drinking water protection. Here is their strategic plan for homeland security which focuses on actions to (1) understand and utilize the best scientific information and technologies for water security; (2) support assessment of utilities’ vulnerabilities to possible attack; (3) take action to improve security; and (4) respond effectively and efficiently in the event that an incident occurs.
Phil Windley discusses sensornets on his weblog, something I've been interested in for several years. A lot of the data he's talking about is already available in realtime on the internet. For example, here is realtime streamflow data for Utah maintained by USGS. Near real-time seismic data is maintained by the University of Utah here. Now, as far as it being available in some readily usable or combinable format such as XML, I don't know. Some data was removed in September 2001 in the interest of national security.
2:51:48 PM
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