Functionality of OG with Drupal 7

A have a lot of positive experiences using OG for D7, however, I created almost every service by myself. It is extremely easy. Following are some examples.

Documentation:

• Documents - content type with the field for File attachments and another field for Image attachments. Make them multiple (I have set 10). Now I decided to presented ALL image fields as Galleries, using http://drupal.org/project/galleryformatter, as it is very rare that somebody would like to upload only one image. It takes some 15 minutes to build and test such Content type. Documents content type is Group content type now, however, if You would like to have much more things collected within it, consider to make it ALSO Group type.
• Manuscript - very simple. It is a content type without Comments. The idea is that Manuscript is subject to Review. There may be unlimited INDEPENDENT Reviews of any Manuscript. Make it Group content type.
• Review - Main function is to discuss Manuscript chosen from Reference field. Set this field to display Full content of Manuscript selected. Make it Group content type.

Events:

• Meeting - content type Based on Date, without Celendar View (as it works insufficiently for me). Standard is to make it Group content type. But if You make it ALSO a group type, You gain a lot of other functionalities, without using standard Signup tool which still doesn't work properly in Drupal 7. For example, You can collect all documentation from particular Event in such a group, organize follow-up discussions and meetings etc. Super!
• Conference - may be the same content type as Meeting, only the mode of usage is different. You can add also Availability Calendar Content type (http://drupal.org/project/availability_calendars) to support conference organization, for example booking rooms, and equipment like LCD projectors etc.

General:

• Agenda - simple Content type, possibly with some attachment fields. In my site EVERY group has Agenda, exposed in full in the Group View. It is not only to describe what the group (or Meeting for example) is, but also to promote the group. Moreover, You can also describe here what materials are private, as they are not visible to general audience.
• Discussion - It is standard content type without any additional functionality besides the category field. I decided to build it INSTEAD of Forums because I'm not sure if Forum application integrates well with Organic Groups in Drupal 7. Moreover, Advanced Forums are also immature. Having category field You can build a simple forum-like View.
• Group Materials - it is a View collecting all materials belonging to the group, besides Agenda which is filtered out. You can present these material ordered by date (newest on top) or grouped by Content type.

As to chapters and regional subgroups - I have no experience, however, I think there are no obstacles to make such things functional as You can make Chapter content type a Group type and Group content type simultaneously. You should only consider and test carefully the matter of hierarchy.

An interesting, in fact entertaining video from DrupalCon Copenhagen, about the new functionality in Organic Groups for Drupal 7:

The new Organic groups - Building social networks in Drupal 7