I used Google Sites to set up virtual callboard for my last show. I used it to post rehearsal reports, a contact list, a script (it was in development) a weekly rehearsal schedule and a calendar. I think it was pretty successful, although there were a couple of members of the production team who still wanted rehearsal reports emailed each night - I just set up a separate email list to those select few.
My company is very tech savvy so I'm lucky in that people are already used to going online to check things. It wasn't a huge transition for us. I did hear that people appreciated having a central location for all information. And I appreciated receiving fewer calls asking when designers could stop by

I would call it a success - and I'm planning on using the same system for our next show.