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IntelliJ IDEA has a great feature: if you hit control-shift-V you see a list of the ten most recent selections you cut or copied onto the clipboard. Here are two ways to get the same thing on all Mac OS X apps.
I think the Shelf module lets you store clips permanently, but I haven’t figured out how to use it yet.
A scissors icon will appear in your menu bar. Whenever you cut or copy a text item, it’ll be added to that menu. Clippings can also be accessed
by a hotkey (default is Control-Option-V.) A little window like the one you see when using the application switcher or the brightness controls will appear. While holding the modifier keys , use the arrow keys to scroll through the stack.