Amazon - Changes the categories drop down on the left when you tab down to an autocomplete that is related on the right.
Chrome - Cmd-1 is the first tab, Cmd-2 is the second tab etc… but Cmd-9 is always the last tab.
/via Mike Cannon-Brookes
Chrome - When a tab in Chrome has updated content, a light gradient moves from right to left on the tab. Keep your eye on the upper left of the video.
/via Tim Banks
Chrome - When closing tabs in chrome, the position of the close button remains the same on both sides.