Tumblr - New blog post menu features icons on strips of paper, which together form one long strip of paper.
OSX - Hitting “Esc” chooses Cancel, hitting “Return” chooses Save, hitting “D” chooses Don’t Save. Allows you to control this menu without using a mouse or trackpad.
/via Andrei Herasimchuk
Mac OS X - When searching in the help menu of an app, the menu relevant to the result is pulled down with a blue moving arrow pointing at the menu item.
/via Stephen Litt Belch
Windows 7 - If the task bar is pulled out to double height or more, Windows makes use of the extra space by adding the day and date to the time.
Typinator - Menubar icon dims when you activate password / security form fields.
Apple - Menu drops down and bounces a little bit. Search bar expands intelligently once activated and shows different search results depending on what page you are on.
/Thanks to Renato for being the first to submit.
Dropbox - Installer for OSX points a large moving arrow at the newly installed menu bar item during installation.