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Lots of good resources linked from this site by Daniele Bartolini: Data Oriented Design Resources
Data-Oriented Design book (2013 beta version) - PDF download
This is a free resource. Feel free to read, copy, download, upload, print, burn to CD, hand to someone on a pen drive, but do not claim the work is your own, or charge anyone for the right to read the material.
As promised, the online resource has also been updated. It is in a new folder here so that links to the old resource still work.
Unfortunately, but due to the scope of the changes in the official first edition, the layout of the chapters has changed. If you have linked to content and want to update your links to point to the new online book, a simple update of the name in your links will not suffice. You will need to hunt down the content you wish to link to in the new document.