I found this toy at Drinkstuff.com. I am not really sure if this USB device will ever get popular. Damn sure, I am not going to buy one of them but still worth going through the site to find many weird toys like these. Nice time pass. You may like a few.
This particular USB Speed Typing Mouse has a pedal and when connected to the USB port, starts pedalling based on the speed you type. You can see the rate in which the count increases on the LCD display.