I've always thought that it's good to know what security context your web app is running in, especially considering there are THREE of them in ASP.NET: two unmanaged (process and thread token) and one managed (HttpContext.User).
Essential XML Quick Reference looks at mainstream XML technologies and serves as a thorough quick reference that answers the most common XML-related technical questions. It provides complete coverage of each topic along with plenty of meaningful examples.
Servlets and JSP: the J2EE Web Tier covers how to install a Servlet/JSP environment and what is in the JSP 2.0, Servlet 2.4, and JSTL 1.0 specs. The book also covers state management, design patterns, internationalization support, multi-client design, Java database connectivity, and more.
Perfect XML