Update (August 14, 2014): Displaying Git notes on GitHub is no longer supported.
I just blogged about the new
git-notes functionality over at the Pro Git blog. If you're interested in using Git notes for something, you might be interested to know that GitHub now supports them and will display them on your commit pages.
If you push notes to GitHub, you will be able to see them at the bottom of the diff when you are viewing that commit. These are separate from GitHub commit comments and are displayed differently. The will look like this:
To learn more about Git notes, read my post. on them, but the short of it is: they're cool for appending notes from automated systems (like ticket or build systems) but not really for having interactive conversations with other developers (at least not yet). Hope you find them useful.