Great setup AJ! I've got the majority of my plants on a system and a good number on a timer. It makes the garden so much more enjoyable, and the plants are happy with a regular schedule. I may try the PVC route next time I set one up. Does the water pool up a bit and soak the whole pot in your setup? I use mini sprinklers in a fast draining mix and they don't always water uniformly. I've started moving the sprinklers around the containers every few weeks and sometimes use second per container. When I saw your setup I remembered some research that they did in China on "alternate partial root-zone irrigation":
http://jxb.oxfordjournals.org/cgi/content/abstract/55/407/2437
The above is not the link I remember, but it's about the same idea. Basically they were trying to conserve water by watering on side of the root-zone independently of the other. I think your setup could be doubled up with a different purpose. If you had two independent lines you could provide more uniform watering and also adjust for pressure loss by having the alternate pipes running in different directions. I'm not trying to say there's a need to improve on your system, but there's some neat things that could be done with two per container. Maybe one could even put some dividers in the pot and try the partial drying experiment...
Thanks again for posting all your great setups.