iOS 6 - Keyboard detects specifics of language and displays correct diacritics depending on the part of a word.
/via beny
Asana - Holding the tab button underlines the first letter of each possible detail to indicate the keyboard shortcuts.
/via Nassar Hayat
Gmail - Typing ? in Gmail (when not in a input field) gives you a cheat sheet of all available key commands.
/via gleuch
iOS - Lower corner radius changes when keyboard pops up.
iPad Keyboard - There are phantom keys in the middle when you split the keyboard in half.
/via Reinier Ladan
iPhone - The Siri button gets the same functionality as the space button while typing quickly.
/via Peter Robinet
Mac OS X - Pressing Alt ⌥ and clicking the volume icon lets you select input and output device.
/via jage
Alfred - Highlights the keyboard-shortcut when you disable all other GUI to access the preferences.
/via Hans Petter Eikemo




