If you are interested in R.A. Salvatore's novels, start with "The Crystal Shard", the first novel in the "Icewind Dale" trilogy. The "Legend of Drizzt" series is quite long and most of the series within it are available in omnibus editions (both soft and hard cover).
Icewind Dale Trilogy (The Legend of Drizzt, Books IV, V, and VI)
Dark Elf Trilogy (Legend of Drizzt I, II, and III)
Legacy of the Drow (Legend of Drizzt VII, VIII, IX, and X)
Path of Darkness (Legend of Drizzt XI, XII, XIII, and XIV)
The Hunter's Blades (3 books)
Transitions (3 books)
The Abyssal Plague novels don't start until March of next year with "The Temple of Yellow Skulls", but if you are interested in the novellas that lead up to the series/event, you can find them in these books:
Dungeons & Dragons Roleplaying Game Official Home Page - Home (Dungeons & Dragons Novel Line)
WotC said:
Follow the five-part prelude novella: The Gates of Madness by James Wyatt, in these novels:
* Part 1: Forgotten Realms, The Ghost King by R.A. Salvatore (July 2010)
* Part 2: Dungeons & Dragons, The Mark of Nerath by Bill Slavicsek (August)
* Part 3: Dark Sun, City Under the Sand by Jeff Marriotte (October)
* Part 4: Forgotten Realms, Whisper of Venom by Richard Lee Byers (November)
* Part 5: Eberron, Lady Ruin by Tim Waggoner (December)
"The Ghost King", for Part 1, is the third book in the Transitions series of Drizzt novels by Salvatore. If you don't want to go all the way back to the beginning of this long series, start with "The Orc King", then "The Pirate King", and then finally "The Ghost King". These are Forgotten Realms novels.
"The Mark of Nerath" is the first novel in the new D&D core world book line.
"Whisper of Venom" is book 2 in the "Brotherhood of the Griffin" series (book 1 is "The Captive Flame"), which is a sequel series to "The Haunted Lands" trilogy ("Unclean", "Undead", and "Unholy"). These are also Forgotten Realms novels.
"Lady Ruin" is a the first book in a new Eberron series.