I think it was December 2010 when I first heard about it through some chatter and later on at DjangoCon.eu in Amsterdam. At first I thought this might be interesting but I wasn't really into using cloud services for this kind of stuff. But then I got the chance to give it a try through a beta invite and some performance constraints on one of my servers. Since then PyGRAZ.org has been running on it and except for the understandable start-up delay on the free plan it was a blast! Basically, ep.io and the workflow when using it set kind of the mark for me on how I want sites to be deployed. It was just so easy :-)
So now that ep.io is gone, Heroku and Gordor seem to be these places where probably most folks will move to. Well, that or just hosting sites by themselves again, as I did with PyGRAZ.org again (with some Fabric-scripting to make deployments as painless as on ep.io).
Bye, ep.io. You will be missed :-(
(The ep.io logo was screenshot'd from the ep.io website)