Here's an undocumented API for 'The Nest' thermostat: http://www.wiredprairie.us/blog/index.php/archives/1442
A quick look at programmable web turns up this... https://xively.com/
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Here's a documented API for the Radio Thermostat company's line of Wifi thermostats (such as the Filtrete 3M50)
http://radiothermostat.com/documents/RTCOA%20WiFI%20API%20V1...
The RT line isn't as pretty as the Nest, but it's way cheaper.