The Primus tea kettle is also a classic design for use out it the wilderness, being lightweight and tough.

http://www.outdoorgb.com/p/Primus_LiTech...amp;country=GBR

For long term use the Simplex No4 Copper Kettle is a classic and has the quick boil heat exchanger base for LPG stove use, which reduces fuel consumption and improves the boil time for domestic use.

http://www.amazon.com/Simplex-Chrome-Ket...8490&sr=1-1

I seem to remember seeing the Simplex kettle being used for Antarctic Expedition use back in the 1980s despite its weight.

The Thermette and Kelly Kettle would definitely be useful for those occasions when access to more conventional fuels is limited although there is nothing to stop any conventional kettles being used with a wood gasifier type stove.