Looking for the mod_rewrite wiki? All of that content has moved into the official Apache HTTPD documentation wiki. Go there.
In addition to the current print edition of the Definitive Guide to Apache mod_rewrite, I'm currently working on a rewrite. The book will be available as a PDF download, and as a print book. Details are being worked out regarding a publisher.
I would love to hear from you regarding the current edition, and what changes and/or additional content you'd like to see in there. Since this book will be distributed in the forms noted above, this has the distinct advantage that it can be updated on an ongoing basis, rather than being forever fixed in one immutable version.
If you'd like to keep up to date on development, and be informed of new releases of the book, please follow me on Twitter.