I8 months ago I learned about the T & T Clark Companion to the Septuagint. It has now been released as an ebook in pdf form, available here, with the hard copy to be published very soon. You can pre-order through Bloomsbury here or through Amazon here.
The Companion is unique in Septuagint studies in that it offers a “handy summary of features for each of the Septuagint books” of the Bible. Here’s part of the publisher’s description of the book:
This Companion provides a cutting-edge survey of scholarly opinion on the Septuagint text of each biblical book. It covers the characteristics of each Septuagint book, its translation features, origins, text-critical problems and history. As such it provides a comprehensive companion to the Septuagint, featuring contributions from experts in the field.
And here’s a snippet from Genesis, via the Google Book preview:
I’m looking forward to checking it out–it looks like it will be a welcome contribution for those of us who want to learn more about the Septuagint.
Words on the Word 
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