I stumbled across this one this morning and thought it was pretty cool. SmartBCalendar simply replaces your stock calendar icon with a new one (that looks exactly the same) but this one is amped up. The icon shows the actual date, and when highlighted the application name displays as the day - very cool. When you click the icon it takes you right to the native calendar app. I know that we shouldn't have to pay for something like this that should be in the OS already, but at only $0.99 its worth checking out.