KeyGhost Keylogger - A hardware keylogger which captures all keystrokes to its internal memory chip. It is software free so it cannot be detected or disabled by software and installs in under
Student Expelled for Using Hardware Keylogger to Hack School, Change Grades
Keylogger: What is keylogging? | Norton
A USB keylogger to record keystrokes | Integra Sources
Keystroke Logging
KeyGrabber Keyboard - the invisible hardware keylogger.