I found some great ideas from my local Utah State University extension on making a PVC drip system at this link. Scroll down through the first part to see lots of great pictures and ideas. Here are a few pictures of the systems that people have built. All pictures taken from the University of Utah extension site and the article that I linked to.
This one is appealing to me as you can open and close various sections depending on what you want to water. Seems to add a lot of flexibility.
This one looks like it would work well too.
Here is one that looks good for a raised bed or square foot garden.
I am sure there are many pros and cons to a system like this. I like the idea that it saves water and I can automate it. I have talked to people that don't use PVC because it leeches chemicals into the soil.What are your experiences with a system like this? Share your feedback, ideas and resources in the comments below.