Most innovative live tiles for WP?

What are some of the most innovative or useful live tiles you've come across in WP?

Here are my favorites:

  • Color Weather: Tile color indicates current temperature (from cold/blue to hot/red). I use the small tile size, which only contains of a simple weather icon (indicating cloudiness, rain etc.), and the background color. After some time you learn how to interpret those colors.
  • Rain Alarm: Warns you if it rains or snows near your location. An indicator similar to a WiFi signal indicator shows the intensity of rain.
  • URL tile: Allows you to pin websites to your start screen and to use any image of your choice as the tile background.