SysAdminGear

These videos will show you how to install iPod Linux:

Part1:


Part2:


From iPod Linux homepage:
"(...) iPodLinux is an open source venture into porting Linux onto the iPod (http://www.apple.com/ipod/). So far, we have successfully ported a customized uClinux (http://www.uclinux.org) kernel to the iPod, and written a simple user interface for it dubbed podzilla. Additional applications and modules have been written, adding many capabilities not found in Apple's firmware."