I would definitely be interested. I'm not interested in giving up the physical call board, but I'm curious about the possibility of having both a physical location and a web forum for doling out information (especially for out-of-town designers and such). What piques my interest specifically is the ability to put documents (contact sheet, production calendar, light plot, scenic drafts, etc.) online so that they can be accessed by all members of the production team at any time (well, any time one has internet access). I'm currently testing Google Docs for that purpose, but have so far been finding it slow to load - and I haven't been able to organize it as neatly as the Streetcar website was, with sections for each design area. Perhaps there's a way and I just need to play around with it more, but so far it's just a list of all my documents - including Google documents from other, unrelated things.
What I loved about the Streetcar site was that there was a main site/call board accessible by everyone, and a separate site for only the production team with a place for the production documents that the actors didn't have a need to see.