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What the heck is a Wakelock? It's the feature Android lets apps use to wake it from deep sleep mode. Wakelocks can keep your CPU awake, they can turn on your screen, and they can make sure your screen doesn't go off. That can be very handy. They can also help kill your battery.
UzumApps' Wakelock Detector is a handy program for seeing which programs have been using wakelocks. It gives you detailed system information that's essential for hard-core battery life analysis. It's not for casual users.
I like this program a lot but to really use it effectively you need to be an Android power user or developer. If that's you, you'll like this free program a lot.