With regard to some of the suggestions and requests:
Trade Goods: Trade Goods and trading are handled in the Arms & Equipment Guide. This book is problematic because it was one of the last 3.0 books to come out, and was a short book in hardcover with B&W pages. Some of the material that was new in the Arms & Equipment Guide have appeared since then, but much has not. Trade Goods, as well as some guidelines on caravan makeup, were covered pretty well.
Drugs: The A&EG also had rules on the effects of alcoholic beverages (which could be considered a model for other drugs). Drugs are handled in the Book of Vile Darkness, as well as Lords of Darkness (already mentioned). Since drug use/abuse is a fairly mature topic, I would not expect to see such presented again outside of the "Mature" line of supplements.
New "special" items: Uh, the A&EG has some.
I think the A&EG is vastly under-rated. Some of the content was quite good, but the whole suffers from the packaging of a short, B&W book into a hardcover.
Trade Goods: Trade Goods and trading are handled in the Arms & Equipment Guide. This book is problematic because it was one of the last 3.0 books to come out, and was a short book in hardcover with B&W pages. Some of the material that was new in the Arms & Equipment Guide have appeared since then, but much has not. Trade Goods, as well as some guidelines on caravan makeup, were covered pretty well.
Drugs: The A&EG also had rules on the effects of alcoholic beverages (which could be considered a model for other drugs). Drugs are handled in the Book of Vile Darkness, as well as Lords of Darkness (already mentioned). Since drug use/abuse is a fairly mature topic, I would not expect to see such presented again outside of the "Mature" line of supplements.
New "special" items: Uh, the A&EG has some.

I think the A&EG is vastly under-rated. Some of the content was quite good, but the whole suffers from the packaging of a short, B&W book into a hardcover.