Ownuser has been making non-OEM battery grips for a number of cameras for some time and the rumour is they will have one for the G1, G2, G10 & GH1 cameras. LINK: For the uninitiated a grip takes extra battery/batteries and includes usually a second shutter button, 'adjustment' dial, and tripod thread. The grip communicates either by cable or sometimes by IR. The camera becomes "square" and as well as extra shot capacity the extra battery gives faster onboard flash recycle times. The extra buttons also make 'portrait mode' shooting much easier.