Tablet stands and chargers used to be two different things before the Mophie Powerstand. The Mophie Powerstand is a new stand designed exclusively for the iPad. The stand both chargers your tablet and allows you to work with its 180-degree rotating neck.
The Mophie Powerstand uses three small arms to hold your iPad firmly in place. The stand can be easily transported as it can be folded flat when not in use. Details regarding the power supply of the Mophie Powerstand are not known, but I would expect it to feature a rechargeable battery and either an AC or USB plug (or both). No pricing or release date details have been revealed, but this is one device iPad-lovers should definitely keep their eyes on.