Some
Linux hackers wrote a second version of the firmware hack that allows Western owners of the Sony e-book reader to translate the user interface into a language that makes somewhat more sense to them (which is debatable of course). In addition, with the new hack you can change the internal time zone to UTC, remove the built-in Japanese dictionaries, and start custom applications from memory stick.
Click here to download Firmware Patch FW 1.0.00.06160
It goes without saying that flashing unauthorized software will void your warranty.