Just registered earlier so I cannot unfortunately put any links to some of his books.
I was surprised with the fanship of many of the books announced on the main page and in the forum that Dan Abnett has so few following his books. I've read many of the titles listed, but really Dan's books, are listed as the top of my favourites! Included with these are the other marvelous Warhammer series books, such as the Space Wolf series, Horus Hersey, Ciaphas Cain (Personal fav!!), and Gotrek and Felix novels, that I always enjoy.
Gaunt's Ghosts series, (listed below), talks about a futuristic Infantry regiment fighting against the dread legions that threaten humankind. Dan has a knack for turning out a different fight and view of it in each book, making every one pretty unique in its own right, that fortunately for us readers never gets old.
First and Only
Ghostmaker
Necropolis
.....(many others!)
to
His Last Command
Armor of Contempt
His two Inquisitor series, Eisenhorn and Ravenor, (think futuristic James Bond ish) are both fabulous series about the hard line defenders of humanity who's purpose is to scour both the traitors within their ranks and the enemies outside.
He also delves into the Fantasy world often teaming up with other authors to produce some master pieces there, such as Ulric's Hammers are just as well written with action and violence.
Last it would be unkind to not mention Ciaphas Cain novels by Sandy Mitchell, who have developed one of my personal favourite main characters, who displays all the opposite characteristics of a hero, but still passes as one of humankind's greatest saviours. I cannot give too much of the plot, as I would hate to destroy someone's read of this series, needless to say, it is my personal favourite.