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If you still are interested in contributing you can easily help out other users in the forums.
If you are a skilled PHP developer, you can start getting your feet wet in the bbPress trac if you want and help out the core developers and core plugin development.
If you are a skilled writer, I can grant you permission of an editor, but I have to see at least 1 or 2 guides written in Google Docs before granting you that role for security reasons. I can give you suggestions on guides to write if you want, or you can just email me some ideas for me to write to.