I’d like to also bring up Sabaki http://sabaki.yichuanshen.de/ as a possible starting point. It’s already written in html5 (and quite beautifull) and has a nice interface to command line go clients.
Creating a command-line tool to play on OGS (I think one would need to speek the GO Modem Protocoll here) could be a viable way to get a Desktop Client, as well as a relatively easy road towards a iOS and Android client.
Prototyping this comand line client in python is something I could do - for the iOS & Android port however, python IMO isn’t an option. Does anybody know?