Our project trello board: https://trello.com/board/plex-on-raspberry-pi-public/510c4d34e1d17df66c00092a
My blog is currently the most up-to-date source of information: http://blog.srvthe.net/
You can always drop in on our developer chat for live help: http://chat.srvthe.net/
Our github sources are at: https://github.com/dalehamel/plex-home-theatre and https://github.com/dalehamel/OpenELEC.tv
You can get rasplex at http://blog.srvthe.net/get-rasplex
We will be hosting rasplex at http://rasplex.com/ starting March 14th