This is a cool idea, very cheap to make, and I think it needs more coverage, so here it goes, my first instructable, how to make an Altoids tin camping stove!
Step 1: What you need:
A mint tin, for this one we're using a rectangular Altoids tin.
A section of fine metal mesh, windowscreen works great.
Some perlite, which is cheap, and easily found at most garden supply stores. I've heard you can substitute fiberglass insulation for the perlite, but I have not tried this and cannot confirm.
Some shears or other tools to cut the metal. Heavy-duty scissors should work fine.
A ruler to measure the tin and screen.
A permanent marker to mark your measurements.
Some sandpaper to remove the paint from the tin.