The Nest is pretty cool, and expensive.. I like that it has a motion sensor and will lower the temp when no motion is sensed.. Apparently it has algorithms and scripts built in that it learns the heating needs of the house..
I however live in a house with one pipe low pressure steam system...And my inner geek commanded me to put together a system similar to what this guy built
A Steam Enthusiast's Outdoor Reset Boiler Control
I have a web portal where I can view the status of the system, and make adjustments, and can receive alerts on my droid if the boiler shuts down on low water etc.. Will be adding methods to control my sump pumps..