Talk about stealth, this guy has made his own DIY USB keylogger, which is actually USB keyboard adapter with a PIC microcontroller “inside” it as its brains.
Of course, keylogging is probably not legal to do unless you have a good reason like you are an FBI agent spying on suspects/terrorists.
Regardless, knowing how one can make a DIY USB keylogger that is also super-stealth is good to know for your own security that there are smart people out there who can