Tomcat Books
Apache Jakarta-Tomcat, by James Goodwill, Apress, ISBN: 1893115364 (2001)
Tomcat Kick Start, by M. Bond & D. Law, SAMS, ISBN: 0672324393 (2002)
Tomcat: The Definitive Guide, Second Edition, by Jason Brittain & Ian F. Darwin, O'Reilly Press, ISBN: 0596101066 (2007)
Professional Apache Tomcat 5, by Vivek Chopra, Amit Bakore, Jon Eaves, Ben Galbraith, Sing Li, and Chanoch Wiggers, Wrox Press, ISBN: 0764559028 (2004)
Tomcat 5 Unleashed, by Lajos Moczar, Sams, ISBN: 0672326361 (2004)
Pro Jakarta Tomcat 5, by Matthew Moodie, Apress, ISBN: 1590593316 (2004)
How Tomcat Works, by Budi Kurniawan, Paul Deck, Brainysoftware.Com, ISBN: 097521280X (2004); there is also a Home Page for this book
Mastering Tomcat Development, by Peter Harrison, Ian McFarland, Wiley, ISBN: 0471237647 (2002)
Apache Tomcat Bible, by Jon Eaves, Warner Godfrey, and Rupert Jones, Wiley, ISBN: 0764526065 (2003)
Tomcat 6 Developer's Guide, by Damodar Chetty, Packt Publishing, ISBN-13: 978-1847197283 (2009)
Professional Apache Tomcat 6, by Vivek Chopra, Sing Li, and Jeff Genender, Wrox Press, ISBN: 978-0471753612 (2007)