I'm a longtime fan of the Warhammer universe and Citadel miniatures in general. I have over 40+ books regarding the subject including:
Word Bearers:
Demon World
Dark Apostle
Dark Disciple
Dark Creed
Faith & Fire
Storm of Iron
The Killing Ground
The Founding (Omnibus 4)
The Saint (Omnibus 4)
The Lost (Omnibus 4)
Ravenor (Omnibus 3)
Witch Hunter (Omnibus 4)
Soul Drinkers (Omnibus 3)
Horus Heresy:
Horus Rising
False Gods
Galaxy in Flames
Fulgrim
Flight of the Eisenstein
Descent of Angels
Legion
Battle for the Abyss
Mechanicum
Tales of Heresy
Fallen Angels
A Thousand Sons
Nemesis
The First Heretic
Prosporo Burns
Age of Darkness
Age of Darkness
The Outcast Dead
Deliverance Lost
Know No Fear
Angel Exterminatus
Vengeful Spirit
Legacies of Betrayal
Deathfire
I have more, but they're in a box somewhere...
I also am working on my Iron Warriors table top army. I currently have a squad of Terminators, a Dreadnought and a single Biker. I haven't had too much time to devote to the things, unfortunately.
I've had to repaint my Necrons due to Matt Ward's stupidity.