Well, here are our current "common topics":
Research & Collecting Tools
Packaging
Dealer Experiences
Valuation
Authentication
Dealer's Forum
I don't know if we should add them, or how we should group them, but some other common topics (including what you mentioned) might be:
Grading (possibly grouped with Valuation)
Storage
Framing
Linen & Paperbacking
Restoration
Conservation