Here's a side-project I've been working off and on during evenings/weekends.
It's called MacGist, a simple menubar application for OS X that allows users to copy selected text in any MacOS application to a (public, for now) Github gist.
Future releases will allow pasting to private gists and filtering of the gist listing so the menu doesn't get too long.
http://luckycatlabs.com/macgist.html
Feedback is appreciated.