SunCalc Measures Sunlight for Planting
While probably unnecessary for most gardeners, the SunCalc might be useful for those with a brown thumb, measuring as it does the amount of sunlight a spot receives over the course of a day. It's $30.
I know—go outside. And I recommend that, too, but since I'm a big fan of gardening, I have a soft spot for anything that might get more people out in the dirt.
Catalog Page [ComputerGear.com via Coolest-Gadgets.com]

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No, this is awesome, even if you have a green thumb. I have a job, and I do things on the weekends. I can't spend an entire day at home, ever.
Suppose I'd be a better gardener overall if I did, but hey.