Microsoft has released a massive 919 page ebook covering everything from how to lock down your web server, web services, web applications, and web application servers. This book is worth a read and I highly recommend it. Improving Web Application Security: Threats and Countermeasures, June 2003 (PDF) (6.7 Meg)

I have recently added Web Services Security, and WebSphere sections to this site. Sometime this month I will also be adding a Weblogic, Apache, and IIS security sections that will provide documentation, and links to relevant security resources. If there is something you would like to add, or see please Email me