While the proverbial "they" always say neccessity is the mother of invention, it's clear that laziness has inspired its share of innovations. If the idea of picking your butt of the sofa to turn the thermostat up (down?) a few degrees is too much to bear sometimes, you can now get your virtual personal assistant, Siri, to do it for you. All you need is a web-connected thermostat and some programming knowledge.
Using an internet-connected Wi-Fi Radio Thermostat and Radio Thermostat's generously-provided API (application programming interface), a programmer known by the Twitter handle @plamoni created a seamless way for Siri to control his thermostat and provide climate updates.
Check it out in action in this video:
While the setup doesn't require that your iPhone be jailbroken, it does require a "pretty solid" knowledge of certificates and openssl, in the developer's words.
If you're interested in running this on your own iPhone 4S, @plamoni has made his code available for all on a Creative Commons license through GitHub.