Goo.gl - When selecting more than one link from the list, the hide button starts showing how many URLs you will hide.
/via Marian Buhnici
Wolframalpha - When you move the mouse to the corner of a result it reveals useful contextual links.
Skype 5.0 for Mac - Displays an arrow next to a person’s mood message. When clicking on the arrow, all links will be opened at the same time.