The Malkoff is a great drop-in, but the G2 isn't the best host. Despite the Malkoff's massive brass heatsink/body, the plastic G2 body doesn't conduct heat away well, and they recommend limiting the runtime in the G2. A 6P makes a much better donor body.
There are lots of lower power drop-ins that don't have that risk.
Surefire's going to release their P61L, rumored at 200 lumens, as already said. Like all things Surefire, they'll be pricey and should be more reliable than the inexpensive Ebay drop-ins.
Here are some comparisons of P60 drop-ins from Malkoff, Ebay, and DX, in a variety of bodies:
www.ar15.com/forums/topic.html?b=3&f=20&t=367207
Quoted: I am very interested in that for my SF G2, even though it costs twice what the original light cost. My question is how can it output 3.5 times the lumens of my current 65 lum, for nearly 1/2 hour longer with the same batteries?
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The P60 is incandescent, and gives off a ton of heat, while the drop-ins are LED and give off much less heat, so the power goes into light and runtime instead. Even so, an incandescent filament is happy at thousands of degrees, while an LED needs to have its heat conducted away so it doesn't damage the silicon.