Since this is a kit module, much of its value will be in the documentation. This is a running list for me of things I'd like to document. I'll update it as I think of things or have issues where folks are confused by something. There is no ETA on this list.

Installation
Update http://drupal.org/node/517182 for the latest changes and add screenshots

Changing the profile content
How to change between the topics/replies/posts views
How to change from FBSS to Guestbook or comments on the profile node
Adding http://drupal.org/project/content_complete
Adding a link to the user's latest blog
Replace built in user visits with http://drupal.org/project/user_visits / http://drupal.org/project/user_visits_adv . Document that built in version isn't good for high traffic sites because it doesn't scale well.

Styling
Why the default is ugly
How to use a drop in style
Common changes

Friends
How to use advanced_profile_friends_gallery_header()
How to change references to "friends" to "connections", etc.
How to change the size of the "friends" avatars
Usage of advanced_profile_friends_gallery_header

Misc
How to change the weight of the local tasks for posts/friends or remove them.
Controlling what node types are shown in "User's topics/replies/posts" views
Replacing the "User's posts" view with a Nodecomment compatible one
Showing different pages to different roles
Showing different content when a user is viewing his own profile

Privacy
How to let the user determine who gets to see what.

Using without Page Manager
Examples on how to use APK via user-profile.tpl.php rather than Page Manager / Panels