Xively
Xively (formerly Cosm and before that Pachube (pronounced Patch bay)) is an on-line database service allowing developers to connect sensor-derived data (e.g. energy and environment data from objects, devices & buildings) to the Web and to build their own applications based on that data.(quote from http://en.wikipedia.org/wiki/Xively).
https://xively.com/dev/help (ex pachube)