Chalkboard Counter is a Google Desktop gadget that allows you count like old shool days using a chalk and a board. Of course: if your block reach five, it will be cut and start a new one.
The gadget shows even a digital counter just in case you get lost.
You can also click or right click in the board to increase or decrease the counter or use the buttons.
This site have an iPhone/iPod Touch version available. Type rodflash.com in your device and try it!