I know the Notifo guy, Chad, was working by himself. Dude's amazing. :)
He's a machine. We're all in awe of him.
+1
You can actually just click the little up arrow to give a +1....we don't really need to know that it was you :)
The Chad Etzel that was with Twitter (part time, I think)?
Yup, that's him. And being his YC classmate I'll also testify the guy is walking talent.
Chad is an animal, a machine, and a nice guy all rolled up into one. As a single founder who can crank out code and prototype fast, I know of few better.