A dial like this could be used so that the numbers could be located on a dial. This means that whenever the dial is turned, a different day is displayed. This could be a very useful feature to think about when I am designing my product.
Eva Solo Magnetic Kitchen Timer... control knob idea: when turning have some sort of subtle tick or click similar to the volume knob on many car radios
Designs that feel physical - | http://uidesigninspirations.blogspot.com
touch-sensitive digital control panel that scans fingerprints and recognizes handwriting