Kelly KettlesI can't say enough good things about these things!
I don't actually have one, but I've used them quite a bit.
Pros:
1/ No expensive fuel to carry/run out of...
2/ Will work with pretty much anything that burns...
3/ Can boil water at the same time as you cook...
4/ Good kits with a variety of items in them and all pack inside the kettle...
Cons:
1/ Not exactly lightweight...
2/ Quite bulky...
3/ Not the cheapest thing around (but is made up for by the lack of fuel costs)...
I'd go for the Stainless Steel versions (personally I'm not a great fan of aluminium in my food/tea). For some unknown reason they're a touch less expensive than the aluminium ones (we're going to charge you more for being stupid enough to buy the ones that will slowly poison you!)?!!?