iOS - Moving the lock slider from left to right gradually fades out the ‘slide to unlock’ text.
Nike+ iPhone app - The color coding of pace on the map is calibrated to the actual fastest and slowest pace ran.
Twitter - In iOS 5, attachments are aligned so that the scrollbar just fits between the view border.
iOS - When “Character count” in iOS is turned on, it will show the character count only if you have at least two lines of text.
/via Bartosz Olchówka
Feather iOS App - The Twitter bird turns slowly green as you type and goes red when you get to the 140 character limit.
/via Anna PS
Path - If you forgot to add one of the three requirements while uploading a photo on Path for iPhone, the buttons bounce as you tap on Save.
iOS - When you enable airplane mode on iPhone, a little airplane icon flies from the edge of the screen.