Pretty fancy for a hobo (original title) stove: http://www.biolitestove.com/campstove/camp-overview/features...
There's a bit of elitism in dismissing this as some some hipster camping stove -- they are addressing a significant real world problem in a very elegant way. I just wish they could make it cheaper.
There are a lot of coatings, metals, and metal alloys that are not safe to burn, including Galvanized Steel (Zinc), Stainless Steel (Chromium), and Magnesium.