iOS - The feature Speak Selection (on Settings > General > Accessibility) shows the characters of the fable The Tortoise and the Hare for the voice speed settings.
/via Victor Boaretto
Mail - When selecting multiple messages the number of envelopes increases from a couple to many depending on the amount selected.
OSX Lion - Lets you number your files naturally and shows them in numeric order.
Previously you needed to number them with an appropriate number of preceding zeroes like f.e.: screen 01, screen 02, screen 03.
OS X Lion - The cursor reflects the fact that a window cannot be resized in a certain direction.
OSX - When unplugging your headphones from a Mac, it automatically reverts to the most recent volume settings of the new output device.
Mac OSX - The world map displayed within the Data & Time system preference panel changes with the seasons.
/via John Blackburn
iOS - If you tap the camera icon in the lock screen of iOS 5.1, it bounces up to encourage you to slide.
iOS Notification Center - When swiping on a notification, it tells you exactly where you’re going in the application.
/via Joshua Kehn
iOS - Lower corner radius changes when keyboard pops up.