Birthdays belong on calendars. But what about events with more flexible due dates? Things like watering the plants, cleaning the bathroom or replacing the water filter every six months. And what about things you're looking forward to? How many days exactly is it until your cell phone contract expires or your homebrew is ready for quaffing with friends? Cosmos Timer is an iPhone app that can track these kinds of events. It can handle events that are only a few minutes (boiling the perfect egg) or several years (your next tetanus booster shot) - and it shows a nice countdown which you can share with friends.