As for the silence, it appears almkglor and stefano are busy working on hl (http://github.com/AmkG/hl/tree/master). I don't know if they still read the forum. I suspect a lot of other people are getting disheartened.
Also, until there's another release of Arc, there isn't much to talk about.
Yes, I think I've followed all of the guides. However, I keep getting the "Permission (publickey)" error. I wonder if there are more configurations like username or email address that have to be the same as what github expects?