Better Builds with Maven has been available for a few years now, initially to those who registered on the web site and then available as a freely downloadable PDF. However, now it is finally available to read online as HTML, bookmark, etc. (in addition to the PDF download). It has also been relicensed under a Creative Commons license.
While the book is now somewhat dated and there are newer alternatives available, the information is still relevant. It has had minor updates as it moved homes several times over the last few years.
I hope you find this useful!

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Brett,
Funny to see this is still around! Glad to see that this will become an indexed, searchable reference for people. I also like your new book quite a bit!
Ken