Dragon Age: Origins has a wide variety of bonuses available; unfortunately, many of them are available only through specific retailers. Here's a breakdown (scroll down for info on free add-on for all versions):

Amazon:

Xbox360 $56.99:
Pre-order Bonuses and $10 Video Games Credit
Pre-order Dragon Age: Origins and get (1) $10 off a future video game purchase, (2) The Lion's Paw boots which add to armor, dodge, and evading missiles stats, (3) Memory Band which add 1% to Experience Points and one skill point, and (4) Blood Dragon Armor, which grants exceptional protection in combat, for use in Dragon Age: Origins as well as in Mass Effect 2. Restrictions apply, see details.

PS3 $56.99:
Pre-order Bonuses and $10 Video Games Credit
Pre-order Dragon Age: Origins and get (1) $10 off a future video game purchase, (2) The Lion's Paw boots which add to armor, dodge, and evading missiles stats, and (3) Memory Band which add 1% to Experience Points and one skill point. Restrictions apply, see details.

PC $46.99:

Pre-order Bonuses and $10 Video Games Credit
Pre-order Dragon Age: Origins and get (1) $10 off a future video game purchase, (2) The Lion's Paw boots which add to armor, dodge, and evading missiles stats, (3) Memory Band which add 1% to Experience Points and one skill point, and (4) Blood Dragon Armor, which grants exceptional protection in combat, for use in Dragon Age: Origins as well as in Mass Effect 2. Restrictions apply, see details.

Collector's editions are available for all three formats from third-party vendors at varying prices.

GameStop:

Xbox360 $59.99:
Reserve Dragon Age Origins and receive a code to download Blood Dragon Armor, a full set of armor that grants exceptional protection in combat. Activate the code in Dragon Age: Origins and the Blood Dragon Armor will also be available for use in BioWares upcoming science fiction epic, Mass Effect 2. Available online and in-store while supplies last.

Online Customers / Store Customers: Code and instruction to unlock the Blood Dragon Armor will come packaged with your game.

PS3: Showing as already available???

PC $49.99:
Reserve Dragon Age Origins and receive a code to download Blood Dragon Armor, a full set of armor that grants exceptional protection in combat. Activate the code in Dragon Age: Origins and the Blood Dragon Armor will also be available for use in BioWares upcoming science fiction epic, Mass Effect 2. Available online and in-store while supplies last.

Online Customers / Store Customers: Code and instruction to unlock the Blood Dragon Armor will come packaged with your game.

PC Digital Deluxe Edition 64.99:

* The Stone Prisoner DLC
* Blood Dragon Armor
* Wardens Keep DLC
* Collectors Edition Download Content that includes 3 items (Bergens Honor, Grimoire, & Final Reason)
* Digital Soundtrack
* Wallpapers
* Memory Band DLC item

EA Games:

Xbox360/PS3 $59.95/ PC $49.95:
Memory band (in-game item)
Fire band (in game item - EA Store exclusive)
The Stone Prisoner
Blood Dragon Armor

Collector's Edition Xbox360/PS3 $74.95/ PC $64.95:

Dragon Age: Origins Collector's Edition contains:

* Collectable and limited edition steel case
* Cloth map of the world
* Bonus dvd
o A making of documentary
o Digital soundtrack
o Wallpapers
o Concept art video
o Strategy video
o And more!
* 3 pieces of exclusive in-game content
o Bergens Honor: A massive helmet made out of dragonbone (+2 to armor, +25 physical resistance, +6 to attack)
o Grimoire of the Frozen Wastes: A special book that adds +3 to all attributes when read
o Final Reason: A magical staff of immense power (adds to damage, spell power, and fire damage)
* Additional downloadable in-game content
o "The Stone Prisoner" downloadable bonus quest and downloadable character, Shale
* Downloadable "Blood Dragon Armor" for Mass Effect 2 and Dragon Age: Origins
o An exclusive customized armor set for both Mass Effect 2 and Dragon Age: Origins

Digital Deluxe (PC):

Includes above plus additional Wardens keep Game Add-On.

PC versions are also supposed to have an exclusive "tool set," but EA doesn't list it in the description.

Free add-on for all - The Lucky Stone, available when you create a character with the special character creator and upload it to your game:

This old stone, set in a golden ring, has been an aid and companion to dozens of adventurers across innumerable years. Its trip to Ferelden was long and convoluted. Some say it has a life of its own.

* Adds +1 to all of your stats
* The Lucky Stone is available from within DragonAge: Origins after you have uploaded a character using the Character Creator.

link located here.