Amazon - Adding an already added item to your wish list will push it to the top of your list.
/via Marko Prljić
Threadless - The shopping cart face turns from sad to happy when you fill it with items.
/via Ahmed Alley
Amazon - When you click “next page” while viewing search results, it instantly shows the first three while loading the remainder.
/via Brandon Benvie
Reeder - Dock icon with unread items indicator upgrade