I picked up the BRS-3000T stove today, a Chinese pocket-rocket style canister stove which is apparently the lightest available, weighing 25g (0.88oz). Verified it with my own digital scales and it is exactly 25g on the nose as claimed. You guys can
pick it up for about $13. A totally non scientific test in my kitchen has it at just under 3 mins to bring 2 cups of water to a rolling boil. The only downside (?) is that it's not the quietest stove ever, but I guess you can use it as an alarm clock to wake other members in your camp as you're brewing coffee in the morning
I had some concerns about cheap Chinese gear failing in the backcountry but I couldn't find any statements online claiming it failed on anyone. And I figure for that price & weight, I could even carry a spare and still be lighter than most cooking systems.
That brings my cook kit weight (titanium pot, stove, spork & small fuel can) down to the 300g/10oz mark, which i'm quite happy with.