Ask HN: Anyone hack on a home automation/security setup?

I'm wondering if anyone has wired their home? I need to replace our thermostat, and I was looking at wireless thermostats, which got me thinking about how I'd like to do something with temperature sensors, maybe a security setup with an at-a-glance to see if all windows are closed/doors locked on a web interface. I'm wondering if anyone has done something like this and can recommend sensors, kits, etc?