In terms of using Calibre, my primary use is to consolidate my ebook purchases, converting them and deDRMing them, and side-loading to my Kobo.
As I use multiple storefronts, it's a necessity to avoid duplicate purchases.
Quote:
Amazon.co.uk
Smashwords
Kobo
Tor.com
Standardebooks.org
Project Gutenberg
HumbleBundle
StoryBundle
Bundle of Holding
Baen
Hive.co.uk
University of Chicago
FadedPage
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Apart from Baen, I've obtained books from all this past year... About the only thing I don't load in Calibre are my RPG PDF files (mostly on the grounds of size).
For all my books (physical and digital), I have an account at LibraryThing.