I was told by my publisher that there was a long back-order queue for the book because they had sold out the first printing. It took a while to print the next lot. Strictly speaking, the next printing has been available for almost two weeks now, but the Addison-Wesley page for the book has just [...]

Some people can read really fast, as the following link shows:
A Quick Read of "Mac OS X Internals"”

Something to look at:
Mac OS X Internals Flyer

FYI:
I will be holding a Mac OS X Internals workshop on Thursday, August 10th, 12:00 noon at the San Francisco Apple Store. This is a part of Apple’s “WWDC: Meet the Authors” line of Apple-store events.
More details here (look for the August 10 calendar entry).