Hints from the drupal forums

http://drupal.org/node/10020 - How to make a block be shown/hidden based on permissions or roles. http://drupal.org/node/13266 - Showing a block only to certain users.

http://drupal.org/node/27407 - How to allow different users access to different forum content

http://drupal.org/node/11751 - How to have both a public and a private forum.

http://drupal.org/node/27516 - Having site changes send email

http://drupal.org/node/23321 - Some discussion of gallery2 and gallery.module

http://drupal.org/node/26988 - Customizing flexinode display (theming flexinode)

http://drupal.org/node/20334 - Implementing paying memberships

http://drupal.org/node/26750 - flexinode categorization with taxonomy

http://drupal.org/node/44308 - Theme that embeds uploaded video

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