Check this out.

http://forum.cockos.com/showthread.php?t=127655

Reaper just released version 4.5 (free update by the way) this guy is responsible for updating the user manual which was release with the update.

"...Great software needs good documentation, and I hope the latest upgrade to the User Guide will deliver this."

As best I can tell he is a volunteer who has taken on the task of not only writting the manual but also keeping it up to date. This manual is awesome.

So anyone want to step up to the plate and take on the task? I would but, ... I have day job. grin