Java Skyline: Learning Servlets - Organized set of resources for learning Java servlets on the Web - includes on-line try-it-out tutorial on HTTP get/post processing. Articles organized into introductory, topical and advanced tutorials. - http://www.javaskyline.com/learnservlets.html
Fundamentals of Java Servlets - The Java Developer Connection (JDC) presents a Short Course on the Fundamentals of Java Servlets - http://java.sun.com/developer/onlineTraining/Servlets/Fundamentals/index.html
Story of a Servlet: An Instant Tutorial - Sun Microsystems brief tutorial on how to write servlets. - http://java.sun.com/products/servlet/articles/tutorial/
jGuru: Servlets FAQ Home Page - Answers to frequently asked Servlet questions. - http://www.jguru.com/faq/home.jsp?topic=Servlets
Cetus Links: Java Servlets - Documentation, introductions, and examples of servlets. - http://www.cetus-links.org/oo_java_servlets.html
Serving it with style - Part II - Continuation of a two-piece series offering a gentle introduction to servlet programming - http://www.developer.com/java/article.php/615271
Serving it with style - Part I - A two-piece series offering a gentle introduction to servlet programming - http://www.developer.com/java/article.php/615131