Dropbox - The dropbox forces developers to test their app before they can release the app in “production” status.
GitHub - The cat illustration on the status page changes expression based on how the site is operating.
Google Flight Search Results - On mobile, Google flight status results include an airplane placed on a line at a point relative to its flight progress. Color communicates whether the flight is on time or not.
/via Erin Olmon
Chrome - Status bar shift down with the cursor when it is hovering a link near the bottom of the page. After a few seconds its hows the entire URL.
Delivery Status app - It detects if you have a tracking number on the clipboard on launch, and it also says from which courier.
/via Patrick Patience