We set up a forum, and its been a great help to our team. You can check out the open part of it at:
http://penfieldrobotics.com/forum
With 5295 posts we make great use of it (and have some fun!)
We have also set up a hidden side of it. Each of the subteams has their own build season section, and we have a Build Season Board that has our engineering notebooks, integration notes, and Safety section. There is also a hidden board for awards. This allows us to discuss all of our build season things, and release them to the public only after build season is through.