Linux on iPod at SourceForge.
Linux on iPod - Documentation
As is the case with many OpenSource projects the documentation can only be described as a work-in-progress!
The currently available documentation:
The Build Instructions.
The User Manual.
A short Partitioning HOWTO.
A few thoughts on the project.
Some basic technical details for the iPod.
Getting started with IEEE1394 (firewire) on Linux.