For snooping, of course. You think you can silently hop fences and climb fire escapes chasing after that cheating wife of yours with a huge D-SLR swinging around your neck? No, but it'd probably be a bit easier with this diminutive camera in your pocket instead.
The tiny device measures a little over 1 inch square and weighs just half an ounce. It uses automatic focus so you've only got one button—for the shutter—to worry about when you're perched on a ledge outside a third story window. In addition to taking 2MP 1600x1200 stills, it also records AVI video at 30 fps at 640 x 480 resolution to the included 2GB microSD—though it does accept cards up to 32GB. But you'd better be quick with your spying, the battery only lasts 30 minutes on a 1 hour charge. It's available from Hammacher Schlemmer for $100. [HS via Geek Sugar]
You can keep up with Andrew Tarantola, the author of this post, on Twitter, Facebook, or Google+.