I usually post these types of things in Software forums but thought it might be useful here as well.  

"Our free Mastering Guide has been updated!
The new 2013 Edition of our free guide, Mastering with Ozone, has arrived! Featuring fresh insights from Jonathan Wyner and other mastering pros, the revised guide covers a broad range of mastering principles and best practices, plus a healthy dose of Ozone 5 tips.
Download the PDF | Download the eBook via iTunes for iPhone/iPad"  

http://www.izotope.com/

Yes, I just posted this notice in another forum. It's useful to anyone who wants to learn more about mastering. The new guide is an easy read. It talks about Ozone but having that is not a requirement.

Nice one Carl.

I usually post these types of things in Software forums but thought it might be useful here as well. 

This is the place you need to post anything if you want more than a dozen people a month to see it, unfortunately.

Thanks for the freebie.

Thanks for making the effort to post this, Carl, I found the old one very helpful.