A few years ago I bought a Zip Sierra stove. This is an interesting bit of kit. It burns charcoal, wood, leaves, anything you care to chuck in really, but charcoal is cleanest and hottest.
Think of a sort of double skinned bucket with a fan underneath to force air under and through the solid fuel.
I had trouble getting one in the UK, and having had a quick Google, I'm not sure they are still even produced.
Pro's - no absolute dependency on gas cannisters or fuel bottles, but in practice I found it easiest to carry a bag of charcoal and fire lighters. It has a 'real fire' feel to it and does great toast. Low tech, no precision parts to let you down. Lends itself to field repairs and general fettling.
Con's - in an attempt to be lightweight, the construction leaves a bit to be desired. Has a tinny feel to it. Although constructed of stainless steel and aluminium (I think), the few steel bits on it tend to rust a bit. Not as instant as a gas/fuel stove. Needs a battery to power the fan and is useless without it. Probably a bit over priced for what it is (at least, it was when I bought mine).
However, it makes an interesting alternative to a conventional camping stove, which is mainly why I bought mine.