SpotOnTheMouse - SpotOnTheMouse is a mouse pointer and keyboard action visualization software.
Screenkey - Screenkey is a screencast tool to display your keys inspired by ...
Kokomite - Add a semitransparent circle -or ring, if you'd rather- to your mouse pointer
KeyCastr - KeyCastr lets you easily display your keystrokes while recording screencasts.
PainterMouse - Enhance the mouse cursor for presentations and demos
Carnac - A utility to give some insight into how you use your keyboard/