Along with our own infection database and tutorials, here is a list of links that we think are also very helpful.
Security Skeptic - Some great information about the basics of Spyware and how it works.
Bleeping Computer - Excellent computer security website with a very active forum to help folks fix their systems.
Wikipedia - Excellent primer on the difference between certain infections and how to identify them.
Winpatrol - Awesome free utility to prevent viruses from taking over processes.