I'll give that one a try. During the coldest days of our winters, the water I bucket to my sheep freezes over in minutes. Once there is snow on the ground, the sheep don't pay nearly as much attention to the water. Unfortunately, when there is no snow and they are eating hay, their water consumption is high. That is the limiting factor on my flock size.
I built a Raspberry Pi based datalogger earlier this year. I had to do some soldering to get a few temperature sensors hooked up. Made the device host it's own wireless network SSID and had it serve a web-page with RRDtool graphs of the data as well as an option to download everything in a CSV.
This was just a prototype, but it was simple enough to set up. If I were to do it again, I'd probably use a RPi and an Arduino. The RPi is powerful enough that you can use modern tools and languages and the Arduino is excellent to doing low-level interfacing with the sensors.
I'll have a look at the existing datalogger projects and see if there is a way that I can contribute.