This is a dumping ground issue for documenting AF's features as it is developed. This is not the place to request features. This is not a complete list and is subject to change.

Theming & Customization
* Encapsulated switchable styles
* 22 template files for detailed theming
* Ability to create substyles that inherit template files and CSS
* Images handled in CSS
* Page Manager integration for customizing through the UI

Forum overview page
* Search in all forums *1
* Mark all forums read
* Integration with taxonomy image for per forum icons
* Folder icons that show new posts
* Linked number of new posts as well as new topics
* Linked name of last updated thread
* Containers split into their own HTML tables for better theming
* Icon legend for forum folder icons
* Forum statistics section with active members, latest member, member count, topic count, and post count

Individual forum
* Search in single forum *1 *2
* Mark all topics read
* Pager on top
* Topic list is a view so fully customizable through the Views UI
* Sticky topics have extra markup to theme whole sticky section
* Updated forum icons from Drupal 7 (easily replaceable within the style instead of stored in "misc" directory)
* Column for number of topic views *3
* Last post shows info from topic starting node if no replies
* Last post shows actual time instead of time ago
* Icon legend for forum topic icons
* Hover over title to see teaser

Topic / Thread
* Link/graphic for new reply
* Search within topic *1 *2
* Header info with number of posts, number of new posts, link to newest post
* With Node Comment, replies are a view *1
* Author pane with information about the poster (Name, avatar, stats, PM, email, etc)
* Hide title of replies if disabled rather than using first few characters
* Uses Signature for Forums if installed
* Link to jump to top on each reply
* Tags separated out into own section
* Image replacement for reply/quote/delete/edit built in
* Links to next/previous topic separated out and put at bottom of thread. Can also be turned off completely for performance.
* Post numbering with link directly to that comment. Acts as permalink as long as the posts per page is not changed.
* Uses Permalink if installed.
* If post is a reply to another post, shows "Reply to #N" with a link to that post.

Additional Views
* Active topics
* New topics
* My posts *1
* Unanswered topics
* OG RON to make your group topic list look like a forum topic list

*1 Requires Node Comments
*2 Requires core search module
*3 Requires core statistics module

Comments

Is it possible to create nested forums in this forum? If so, up to how many levels?

Yes, you can go as deep as you want with the hierarchy. it's all taxonomy.

In the future, please start your own issue for questions. We like to keep each issue on topic or it gets confusing.

Version:6.x-2.x-dev» 7.x-2.x-dev

I found a very useful screencast here: http://www.youtube.com/watch?v=V5SUPVOCR1c