I've spent the last couple of years working on a system similar to this. I've designed a modular aquaponics/microponics system with a portable greenhouse, custom biofilter, gravity-fed drip irrigation and solar and geothermal heating, all based on UNIX principles: modularity, simplicity, standard interfaces, robustness, ease of repair and maintenance, extensibility, and of course automation. I haven't had time to document much so far, but I made a little introduction video you can see here.
I use Arduinos to monitor temperature and soil moisture, and to control pumps, heaters, and irrigation valves. There's a modular chicken coop, with automated doors also controlled by an Arduino. The Arduino is a great platform for this type of thing. It's extremely reliable, easy to program, and extensible. For example, I decided I didn't like any of the existing relay shields available, so I created my own shield that controls eight standard irrigation solenoids. That was very simple thanks to the openness of the Arduino platform.
The garden isn't quite year-round yet, but that's the eventual goal. If you setup everything right, it really isn't much work to maintain, just like Open Source software. My concentration has been on automating as much as possible, while sticking with organic and permaculture growing principles. I started out by eliminating daily chores, then moved on to automating weekly tasks. At the moment, my system can go for a month or so without intervention, and most work is bi-annual.
Everything is interconnected in one way or another. Grass clippings go into the chicken coop. Chicken litter goes into the compost bin, along with paper trash and kitchen waste. Compost goes on the garden. The chicken coop and compost bin provide shelter for beneficial insects. Fresh water goes into the fish tanks. Fish-fertilized water goes onto the garden, and into the duckweed ponds. Duckweed supplements the fish and chicken feed, and provides clean, fresh water.
I think this is just one of many great directions for the future of the Open Source movement. It's easy to predict that projects like Arduino, RepRap and Open Source Ecology are going to make a huge impact on the world in the coming years, in much the same way that Free and Open Source software have shaped technology over the last decade.