Vibrating Mouse Shakes Up Your Surfing 
AVB unveils pointing device that jumps when your PC makes a noise.

A small motor spins inside the mouse, varying speed and duration "to simulate
the sound that is being communicated." When your system delivers an error
message, you'll feel its pain. When you have e-mail, you'll know by the small
tremor in your mouse.  

http://www.pcworld.com/cgi-bin/pcwtoday?ID=18223
http://www.avbtech.com/avbtech/vmouse.htm