A really impressive Emacs project: an entire pastebin website, using elisp as its backend!
miniblog.
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Cute Smalltalk pastebin: http://t.co/ws9ytfc3LS . I think there's still room to innovate with lang-specific pastebins, but spam is tedious.
Nifty, a command-line pastebin: http://t.co/JHoae6BO7i