Amazon - When you click “next page” while viewing search results, it instantly shows the first three while loading the remainder.
/via Brandon Benvie
Rdio - When you mouse over the forward/back buttons on the Rdio player, it tells you what track is coming up next in the playlist/album.
/via niczak
Reeder app - When reading an article, scrolling up and down shows a preview of the previous/next article, and by releasing this article is loaded.
