Amazon - When changing an item’s quantity in the basket to 0, a link to remove the item appears. /via Alex Muller
Coda 2 - The submit button of the order form doubles as a progress bar. /via chrishrmnn
Google Calendar - Example text changes based on the length of the added event. /via @faccig
Coda 2 - The sidebar is color-coded to show how “deep” the code is indented on each line. /via Juan-Pablo Scaletti
Stack Overflow - Comments with links to “Let me google that for you” are not allowed. Read more here. /via Boldewyn
Google MapsGL - The shadows cast by the buildings are relative to the current position of the sun. /via Chaotic
Google Docs - Pressing ⌘+s (ctrl + s) the first time will save the document in the interface, while pressing it again will open the default browser dialog to save the page to your hard drive. /via Gr...
Google+ - When searching, the page indicator arrow slides from the left side to the top. /via Vedran Židanik
eBay - When viewing an item that you’ve purchased in the past, the button changes from “Buy It Now” to “Buy another.” /via Jason Seney
Asana - The registration process implements the same interface as the application, introducing first-time users to the product. /via Jorge Salinas
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, s...
Google+ - Uses your gender in translations. If you are a female Spanish speaker, the sentences are written in the feminine form. /via Lucia Soto
Facebook - When using an external chat application all chat notifications are turned off. /via Joshua Kehn
Twitter - After you change your password, the system reminds you how many apps have access to your account and lets you review them. /via Rolando Murillo
Sparrow - Has different drop zones for different ways to attach files. /via Ian
Vimeo - THe option for not upgrading to the new vimeo is a “I hate change” button. /via Joe Ortenzi
Doodle - Compresses dates that you did not select times in like an accordion. Clicking on the accordion expands the entire calendar. /via Ben
Tumblr - The copy inside the age verification form, when signing up for Tumblr, changes depending on the value. /via okdan
Amazon - The last lines of the review text fades out with an option to show the entire review.
Harvest - When asking for support, the current time at their offices is shown beside their opening hours. /via Nicolas Bouliane
Vimeo - When visiting a non-existing page on Vimeo, the title is VimeUhOh. /via Joris-Jan van den Boom
Asana - Holding the tab button underlines the first letter of each possible detail to indicate the keyboard shortcuts. /via Nassar Hayat
OS X Lion - The cursor reflects the fact that a window cannot be resized in a certain direction. /via Evan
YouTube - When typing in the search box, recently made searches are shown in purple. /via Davide Dettori
Thunderbird - The little ‘+’ in the welcome screen tabs rotates to an ‘x’ when clicked. /via Hans
Android ICS - The screen skews when you try to swipe further in that direction. /via Tony
Mail - Mail gives you the option to display the telephone number across your entire screen so it’s easier for you to read and dial it. via Hoyd
iPhone - When you plug your iPhone, it vibrates to indicate that it’s charging. /via Pierre Valade.
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
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