I'm looking forward to the second Hellboy film, so this week I've rather immersed myself in Hellboy media.
I rewatched the first film, and enjoyed it. I'm not sure about all the decisions they made but they certainly nailed the look and feel of the comics just right. From the shorts I've seen, the second looks like it will be better.
BPRD comics: The Dead, The Black Flame, The Universal Machine and The Garden of Souls. I'd read just a few of these, mainly borrowing a random selection of the monthly comics. Reading the whole of the stories, and in order, was a big improvement. The Black Flame and The Garden of Souls stood out, building up the mythology of Hellboy/BPRD in the former and Abe's history in the latter. Great stuff.
Hellboy: The Troll Witch and Others is a selection of Hellboy stories from his past, like The Chained Coffin and Others. Some really fun ones in here, although I find the collections a little of a letdown compared to the stories that move the story along.