Various Twitter users, the team at Consumer Reports and our own Giz editors are reporting problems getting their new iPads to charge via USB. So far, it looks like it will only charge when plugged into a Mac.
Consumer Reports found that PC USB ports, keyboards with USB ports and accessories such as USB hubs don't work. Apple Tech Support told them the device was designed to be charged with the included wall plug. Mark said that he could charge using his iPod wall plug, but that USB charging on his MacBook Pro wasn't working.
UPDATE: An anonymous Apple employee says that the USB ports can't be low power...
"I work for Apple & will give you some insight on the charging issue. The reason the iPad doesn't charge thru most USB ports is due it requiring 10W of power to charge it."