Original post here:
Click HERE for the CT50, and HERE for the CT80.
This arrived last week, and it’s everything I hoped for, plus more. VERY programmable via back-end JSON interface. Of course, I’m old-skool and stubborn so I wrote a whole web-app in bash to control it 
Here’s what my interface looks like:
Click it for a full size version.
The outside temp/humidity is polled via weather underground (XML feed), and the graph is gen’d by cacti. I already use cacti for tons of other stuff, so it was only natural to use it for data collection here. The red vertical on the graph represents the periods my furnace runs. The rest of the legend it pretty obvious if you look at the full size snap.
If you’re even remotely THINKING of getting an ip-enabled thermostat, get one of these, they rock.
For those that don’t want to write their own app to control it, it can communicate directly to radio thermostat’s website and you can control it from there. I just don’t like the idea of my thermostat taking orders from someplace else, so I wrote my own
There’s good documentation of the API here:
http://central.isaroach.com/wiki/index.php/Main_Page