I have found a Rockbox Installer. It does everything(excluding the latest build). http://www.ipodwizard.net/showthread.php?t=8585. scroll down find rockboxinstallerv7.1.zip. when its done downloading open the folder and open the installer batch file. follow the oncreen instructions. after its done and you click finish. go to http://www.rockbox.org/download. find ur ipod and click "latest" under your ipod's picture. after the download extract the rockbox.ipod and the folder .rockbox in the root(top level) of your ipod. disconnect properly and it should reboot automaticaly. enjoy Rockbox.
