Review Board has been a fantastic tool for software developers for many years now, but over time, we've seen people try to use it for reviewing things beyond code. We've therefore been working to make Review Board useful to a wider audience beyond just developers.
Lately, we've been working toward the first part of this, a Review Board extension to enable peer review of PDF documents. We'll be holding a private beta of this extension pretty soon, and are opening up a sign-up form for those who are interested in giving it a try and giving us feedback.
In order to help fund the Review Board project, we plan to make this a paid extension (but free for open source or educational use). In exchange for your comments and feedback, participants in this beta will be offered a discount off the list price once we hit 1.0.
If you'd like to participate, please fill out the signup form and we'll be in touch.