Something I've been meaning to do for a while is assemble a knowledge base of common specific problems. Kind of like the FAQ, but less "how do I do this?" and more "It broke like X, how do I fix it?"
The first article: http://wiki.squid-cache.org/KnowledgeBase/NoNTLMGroupAuth It might get merged into the FAQ, I'm not sure at this stage. I'll start populating it as I see squid-users posts w/ solutions that I think merit recording. Adrian