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(Related Gallery: 20 of the coolest gadgets and must-haves for your office: Part 1)
The Cobra Tag is a must-have for anywhere, really. Basically, you attach this device to your key chain, install an app on your phone, then use one or the other to find... well, one or the other, depending on which one you can't find. So, if you're running late for work one day and you can't find your keys, you use your phone to contact the device attached to your keys so it'll shout at you, thus letting you know where said keys are located. Simple, but awesome.