Below are some web sites and mailing lists that may be used to learn more about Linux and AFS. I found that a couple of sites referenced in the book had moved. Don't be surprised if some of these sites have moved again.
http://www.transarc.com/ is the URL for the Transarc Corporation home page.
If you are already an AFS licensee and have a transarc.com account, you may access ports of AFS done by Transarc customers. These ports are available from Transarc on an “as is” unsupported basis from: /afs/transarc.com/public/afs-contrib/bin/README.
The Linux-AFS FAQ can be found at http://www.umlug.umd.edu/linuxafs/. linux-afs@mit.edu is the list for general questions, information, help, discussion, etc. about Linux-AFS.
The Linux-AFS bug reporting list is located at linux-afs-bugs@mit.edu.