Communicating within your own team should be facilitated just like any other project. If you were using a proprietary system, there would likely be a number you could call to get service or help when you need it. Drupal doesn’t have an official or formal help desk you can contact.
Thank you for your interest. I apologize for any inconvenience this limited access causes. This online guide is now a book called Drupal: The Guide to Planning and Building Websites. The content of the guide is being updated, expanded, and edited. It will include tips for D6 and D7. I hope you will find it useful.