Those Engineers at Purdue
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Engineers at Purdue University have been doing some exciting things. They have been working on hydrogen based energy source development. The article I read discusses the idea of adding water to aluminum and gallium. Aluminum does its oxidation thing (the search for oxygen) and splits the water. During this process hydrogen is generated. The gallium prohibits aluminum from solidifying through oxidation. So the aluminum will continue to try to oxidate and generate hydrogen until it is used up.
There is lots to this, but the upshot is in a car trip of 350 miles that costs $66 with gas at $3.30/gallon. The same trip using aluminum could cost $70. If you were to supplement by using a 50% efficient fuel cell, the trip would be $28. This would also burn cleanly. Very cool stuff!