Power for a whole day?

This article about a new battery technology is very interesting. SION Power Debuts First-Ever Lithium Sulfur Battery at Windows Hardware Engineering Conference; New Battery Powers an HP TC1000 Tablet PC for the Entire Day on a Single Charge. I found a link to the article over at the Tablet PC Buzz.com forums. Can you imagine how great this will be? Using a tablet pc for a whole day with only one charge would be incredible. And, the ramifications for all other battery-powered equipment... Cellular phones that work for two months on one charge; PDAs that go for one month on a single charge.