aracer: "Then again if I was going out lightweight backpacking myself I'd not take any of those, or indeed anything else so far suggested - though a couple have got close. I'd take my homemade hex burner made from a tin can - burns far, far more efficiently than using hex tablets with the standard burner, since it sets up a proper updraft of air. Should time it sometime, but boiling speed isn't that far off a gas burner, whilst it also uses less fuel than a normal hex burner. Does anybody think there's a market for such a device, as there's nothing like it I've seen for sale - I've always wondered why the proper hex burners aren't made like mine? "
When you say hex tablets, do you mean solid fuel things? If so, I reckon there might be, though it'd depend how easily your tin can burner can be made I suppose- the people inclined to buy this sort of thing might also be inclined to make their own. I'd be interested myself though (or, if you can give me more info on your DIY stove that'd be great!)