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Maybe we need a Groups module now, similar to the OG modules on Drupal, just to make it all a bit easier to make groups add images to groups have group homepages, group forums etc.
Organic GroupsFor those who don't want to go to the link summary below
"Enable users to create and manage their own 'groups'. Each group can have subscribers, and maintains a group home page where subscribers communicate amongst themselves. They do so by posting the usual node types: blog, story, page, etc. A block is shown on the group home page which facilitates these posts. The block also provides summary information about the group.
Groups may be selective or not. Selective groups require approval in order to become a member, or even invitation -only groups. There are lots of preferences to configure groups as you need.
Groups get their own theme, language, taxonomy, and so on. Integrates well and depends upon Views module"