I did a bit of maintenance on the FAQ this evening. I added some additional books as suggested by RalphChristie (thanks Ralph, sorry to take so long) and checked and modified a few links.
The Areva NPAG site has changed and now you have to fill out a form before you can access the download. I didn't so I don't know for sure if the download is still free. The hard copy is no longer available, but well worth picking up if you find a copy for sale. Does anybody know a link that goes directly to the download version?
The ABB transformer link now seems to have only one of the three books listed, does anybody know if the other two are still readily available (I didn't feel like chasing my tail through that site tonight, may be later)?
Another new recently published book that is a great reference is the Handbook of Power System Engineering by Yoshihide Hase. Although the book could probably be better organized in terms of chapter sequence, it is a great reference to have and covers more advanced topics not found in many other books such as detailed chapters on Clarke Components.
Electrical Insulation of Rotating Machines
ISBN 0-471-44506-1 from IEEE series on Power Engineering
Title is somewhat misleading, found this a very good reference on generators and motors.
Protective Relaying for Power Generation Systems
ISBN 0-8247-0700-1 from CRC Press
Published in 2006, has some very good updated info, at least based on what I have been able to find.
Thank you for putting this together, a real wealth of info.