Reddit reviews All Colour but the Black: The Art of Bleach

The first databook/character book is Souls.

The second is Masked.

The third is Unmasked, but it's not in English yet. There are unofficial translations all over the place online.

There is Color Bleach - The Official Bootleg, which has a lot of little "behind-the-scenes" stuff.

And there's All Colour but the Black, which is an art book. Most of the earlier full color spreads and stuff are in there.

Most of the information found in all the databooks and bootlegs and stuff is already online. A lot of it is in the Bleach Wiki. You'll have a hard time finding the actual book to read. Most of the info is just integrated into everything else.

I own Souls, Masked, and All Colour but the Black. I recommend them if you're interested in learning little bits and pieces about characters and such. They also have small posters and stickers that come with them. The art book is really nice if you like Kubo's artwork, because it has full-size renditions of the color pages from the manga. However, there's nothing in the databooks or anything you can't find online, nothing really specific to them.

Art is from All Colour but the Black for anyone who's interested.

Edit: updated original link to smile link.