Firmware update to help with the following:

-Improved Auto Focus performance for the subject in low contrast.
-Decreased the operation noise of Auto Focus in Motion Picture recording for H-H020 lens. (In order to minimize the operation noise of Auto Focus, the Auto Focus operation speed is reduced in Motion Picture recording.)
-Improved the stability of AE(Auto Exposure) control for H-ES045 lens(to be introduced in Oct., 2009).

You can download it here:

http://www.downloadplex.com/Drivers/Firmware/Panasonic/panasonic-lumix-dmc-gh1-firmware-1.2_193912.html