Here's a nice "dick move" by Nest: http://www.houselogix.com/dev/nestthermostat.asp

A third-party developed a commercial "driver" module for Control4 whole-home automation systems to talk via IP to Nest Thermostats. Nest asked them to stop developing it and remove it from the market.

I believe (along with many on the C4 forums) that the third-party used the word "ask" very liberally and kindly wrt to Nest's request.