I saw a neat little portable grill in the store the other day, Delecto model by woodflame. It uses wood for fuel and electricity for a draft fan. It can use 110, 12v or batteries.
I really like the idea of using wood instead of disposable propane bottles and you can use hardwood instead of relying on their recycled wood cubes for fuel. It says it can hit over 1000F @ ~60,000 BTU. <Thinking of Susan and her seared tuna here>.
Edit: It says it can hit over 1000F @ ~60,000 BTU in 2 minutes and the bottom is cool enough the unit can be placed on a plastic table cloth.
One 2" cube of wood is supposed to be sufficient for 8 burgers or 4 steaks. I wonder how easy it is to snuff when you are done?