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The weather has been hot, and a few of my sprinkler heads have been acting up, so I went outside to replace a few (and by a few, I mean about 20).
I've got a 36 zone system on 5 acres, managed by three Rain Machine units. I've set up reserved DHCP addresses for all three units, and port forwarding on my router. So even when I was outside of WiFi range in most of the back yard, I just put my iPhone in a zip-lock baggie to keep it dry and was able to walk around the back yard, turning zones on and off, without having to run back and forth to the garage.
It was SO nice.