When doing an inspection, undoubtedly you will come across something you haven't seen before. At least I know I do. Not all the time, but every once in a while a builder or a homeowner will do something that leaves you scratching you head. Where do you go to find out about the issue?
Here are a few websites I find particularly useful (most of the time):
http://www.inspectorsjournal.com/ (especially the "forum", which I recognize quite a few of you from)
http://www.iccsafe.org/ (when I have a code question)
http://www.mikeholt.com/index.php?id=homegeneral (good for eletrical questions)
So, who has any other sites or resources they find particularly useful (especially if it is specific, i.e. plumbing, roofing, HVAC, etc.)?