New battery technologies are all the rage - but this one seems the most promising. It would be nice to have an iPod run 20-24 hours per charge. From the story:

"At Microsoft Corp.'s annual Windows Hardware Engineering Conference, SION Power Corp. (www.sionpower.com) made history by demonstrating the first-ever lithium sulfur (Li-S), very high-specific energy rechargeable battery as a power source for a notebook personal computer. Located in the Microsoft Small Business Partners Pavilion, the SION battery reliably powered an HP TC1000 Tablet PC for the entire day on a single charge"

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Sion Li-S Summary