KeyboardLock lets you reclaim desktop space any time you need it by locking your keyboard. Once locked, you can safely place things on it, and still use your Mac for anything that doesn't involve typing. The keyboard is toggled simply by moving the mouse to one corner of the screen, so it's a snap to use. Or you can use AppleScript to password protect your keyboard.
What's new in KeyboardLock (PPC)
Vesrion 1.5 is now MacOS 9 compatible and adds the ability
to selectively lock the Help, Caps Lock and Power Keys; as well the option of
adding sound to keystrokes. Locking may also be set to occur after a
specified period of user inactivity. Keyboard lock is fully scriptable and
may be used in either a low security, accident protection, or high security,