Sprinkler system

I'm going to be putting in my new sprinkling system this summer and as I was researching the web I found a really cool tool on RainBird.com. They give you instructions on how to measure your lawn and put it on a grid. When you send it to them, they design the sprinkling system for you. It comes back to you with charts showing what you need and where (even taking into account low and high spots), along with a complete list of parts that you'll need and their prices.