dpaste.el provides functions to post a region or buffer to http://dpaste.com and put the paste URL into the kill-ring.
Put this file in a directory where Emacs can find it. On GNU/Linux it's usually /usr/local/share/emacs/site-lisp/ and on Windows it's something like "C:\Program Files\Emacs\site-lisp". Then add the follow instructions in your .emacs.el:
(require 'dpaste nil) ; Not needed if you use package.el
(global-set-key (kbd "C-c p") 'dpaste-region-or-buffer)
(setq dpaste-poster "Guido van Rossum")
;; or the preferred method of adding your `user-full-name variable
(setq user-full-name "Guido van Rossum")
With C-c p you can run dpaste-region-or-buffer. With a prefix
argument (C-u C-c p), your paste will use the hold option.