I'm probably late to the game with this one but just discovered GitHub Pages
Gonna give it a test drive and then might migrate DeeEmm.com over there
My only concern is that being owned by Micro$oft, there's every possibility that at some point in the future they may decide to drop this service, although to be fair a similar sentiment went through the ranks when M$ initially took over GitHub and that's been fine (So Far.)
I've been thinking of moving the site from Joomla to Wordpress for a while now, but moving it to GitHub would also work (especially as it's one less server to worry about updating)
Will see how it goes.