Hi
The following FDTD books are available in the e-books section of eda board:
1. Computational Electrodynamics: The FDTD method, Taflove
2. The FDTD Method for Electromagnetics, Kunz & Luebbers
3. EM Simulation using the FDTD Method, Sullivan
4. Grid Computing for Electromagnetics (There is a chapter on the implementation of Parallel FDTD)
5. Numerical Techniques in Electromagnetics, Sadiku (There is a section on FDTD)
6. PML, Berenger (this is not a book, but a report on PML, I think)
Some other ebooks in this section are also having either a chapter or a section on FDTD.
Time Domain Methods for MW Structures: ANalysis and Design, edited by Itoh is a good collection of classic papers (like Yee, Mur, Berenger, Taflove etc) on FDTD. Unfortunately it is not available as an ebook.
SM Rao's Time Domain Electromagnetics is another good book.
Poljak also has written a couple of books contating FDTD.
Parallel finite-difference time-domain method by Yu, Mittra et. al is another good book.
Moreover, most of Taflove's papers (100+) are freely downloadable from his site.
Likewise, S Gedney's FDTD tutorials, Schneider's Lecture notes, and Dennis Prather's class notes are also available in the internet (Just search with the author/Lecturer name to find the site).
Best Regards
Jithesh