So you'd like to...

read the Diablo novels in chronological order

A guide by Larry Zieminski (Vail, AZ, USA)
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Products sampled from this guide:
There are many Diablo tie-in novels out there, but it can be confusing as to what order they should be read in. This guide should help you. I'm putting them in chronological order (based on Diablo history, not book release order). I got most of this information from the Diablo wiki.
The Sin War Series The Sin War series is set several thousand years before the events of the first Diablo game. Birthright (Diablo: The Sin War, Book 1) (Bk. 1) Scales of the Serpent (Diablo: The Sin War, Book 2) (Bk. 2) The Veiled Prophet (Diablo: The Sin War, Book 3) (Bk. 3)
Demonsbane Diablo: Demonsbane is set several hundred years before the events of Diablo 1.
The Black Road The Black Road (Diablo, Book 2) is set a little before, then during, the events of Diablo 1.
Legacy of Blood Legacy of Blood (Diablo, No. 1) takes place right before, then during, the events of Diablo II.
The Kingdom of Shadow Kingdom of Shadow (Diablo, Book 3) takes place concurrently with the events of Diablo II.
Moon of the Spider Moon of the Spider (Diablo, Book 1) takes place after Diablo II. It is the sequel to The Kingdom of Shadow.
The Order Diablo III: The Order was released to tie in to Diablo 3. It brings the written universe up to date with the computer games.
Miscellaneous Diablo Archive is a collection of 4 of these books, but it doesn't appear to be in Diablo history chronological order. <product no longer available> was released in conjunction with Diablo 3, but since it isn't a novel, I'm including it here in the miscellaneous section. The book presents itself as an actual book from the Diablo universe. It has tie-ins to Diablo 3 though, so it should be ready towards the end of your Diablo reading order. Be sure to play the original games Diablo Battlechest [New Version], which Blizzard still supports. The newest game is Diablo III - PC/Mac. EDIT: Guide updated October 2012.

Products mentioned include:
The Sin War Series
1.  Birthright (Diablo: The Sin War, Book 1) (Bk. 1)  by Richard A. Knaak
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2.  Scales of the Serpent (Diablo: The Sin War, Book 2) (Bk. 2)  by Richard A. Knaak
$8.99 Used & New from: $0.24
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3.  The Veiled Prophet (Diablo: The Sin War, Book 3) (Bk. 3)  by Richard A. Knaak
$8.67 Used & New from: $0.01
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Demonsbane
4.  Diablo: Demonsbane [Kindle eBook]  by Robert B. Marks
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The Black Road
5.  The Black Road (Diablo, Book 2)  by Mel Odom
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Legacy of Blood
6.  Legacy of Blood (Diablo, No. 1)  by Richard A. Knaak
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The Kingdom of Shadow
7.  Kingdom of Shadow (Diablo, Book 3)  by Richard A. Knaak
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Moon of the Spider
8.  Moon of the Spider (Diablo, Book 1)  by Richard A. Knaak
$7.40 Used & New from: $0.01
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The Order
9.  Diablo III: The Order  by Nate Kenyon
$19.21 Used & New from: $0.01
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Miscellaneous
10.  Diablo Archive  by Richard A. Knaak
$16.46 Used & New from: $2.45
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11.  Diablo Battlechest [New Version] [CD-ROM]  by Blizzard Entertainment
$19.99 Used & New from: $8.20
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12.  Diablo III - PC/Mac [CD-ROM] [DVD-ROM]  by Blizzard Entertainment
$29.99 Used & New from: $8.95
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