In addition to this particular WordPress theme, you can use plugins and Subscribe to Comments to receive notifications of new posts in the email. In addition, you can add a sidebar list of useful links and a list of sponsors of the draft. Of course not required to use this theme or create a mini-blog on a subdomain, the key feature is to make a place where all members of the group could communicate. You can use services for collaboration or special applications – depending on what you like.
You can simply remove the possibility of posting the authors also make a more complex configuration of roles - the decision is yours. But it is you need to make sure that each team member understands what is expected and what kind of options (right) when working with a blog it has.
No matter how you will be able to implement this plugin - through Google Apps or the creation of additional boxes on hosting of WordPress theme, but all corporate email services are considered as an indicator of professionalism in some degree. 
