This optical vibrating mouse comes with a motor that can be turned on and off using a switch below the scroll wheel. The mouse has 3 buttons as well as multiple bumps on the "palm" surface (for comfort?). This reminds me a lot of Logitech's iFeel mouse that used Immersion technology. I wonder if this mouse — which is incidentally made by a Japanese company named Laos — vibrates when the cursor hovers over certain elements on the screen. Available for Windows only, this USB mouse is retailing for 2480 Yen (USD$20).
Laos Vibrating Mouse [NewLaunches]