I'm trying to get hold of one of these from the states at the moment...
It's a Vargo Triad XE, titanium dual fuel burner. That little pot on the left is the alcohol stove. It's tiny and just drops into the stand, which becomes a priming pot.
Like others, I think the crusader unit is an excellent design, suffering only from a total lack of adequate stove that fits. I'm hoping this vargo unit will fit inside and the pan inside the crusader cooker, will then become the vargo's priming pan.
The triad is a pressurised stove. The prime causes the fuel to heat up and evaporate at a fast rate, pressurising the stove and making the jets burn fiercly - the heat output should be greater than a regular trangia. The downside is it's not easy to refill while hot, so simmering is out of the question. A full triad should burn for about 15 minutes, no simmer option. It's designed to consume all the fuel you put into it in one go, so it's a bit all or nothing. That said, if it's just about making brews or boiling rice/soup I would think I you would get to judge the amount of fuel needed pretty quickly. Another downside is it's quite expensive.
I'll let you know how it turns out.
I'm hoping it will turn the crusader into a genuinly useful bit of kit.
http://vargooutdoors.safeshopper.com/181/1549.htm?506