Developer bponury, the mind behind WifiKill and FaceNiff, has created something that looks pretty awesome, if you're the owner of a GSM-enabled HTC Evo 3D. That something is the Slide 2 Wake kernel, which allows you to wake and lock your device by sliding a finger across your Evo 3D's capacitive buttons. The kernel is still in its very early stages, but seems to perform quite well.
While the kernel is only running on one very specific device for now, there is hope for at least a port to the CDMA variant of the 3D, and perhaps other devices with capacitive buttons as well. For more info (and the download) head to the XDA link below.