Building Internet Firewalls, 2nd Edition by Elizabeth D. Zwicky, Simon Cooper, D. Brent Chapman 
Database Nation by Simson Garfinkel
Delphi in a Nutshell by Ray Lischner
Developing Secure Applications with Visual Basic by Davis Chapman
Ethernet: The Definitive Guide by Charles Spurgeon
Java Performance Tuning by Jack Shirazi
Learning WML, and WMLScript by Martin Frost
PostgreSQL: Introduction and Concepts by Bruce Momjian