Hi,
I did a lot of research yesterday trying to decide on and SG contrib. I was really happy with how it went and I can tell you did a lot of work to make this work like it should. I wanted to call your attention to something though. If you add categories to the Squidguard_Block db entry and expand templates it creates the sg dest section and adds it to the ACL. This makes it VERY easy to use kudos. The problem comes in when you want to use the reserved word in-addr so that you cant access sites via IP. Creating a dest section here is not needed and in fact if you do not have the directory structure set up, it causes sg to go into emergency mode. Obviosly I could create custom templates to accomplish what I want, but I though I'd make mention of it for future consideration.