This is the wiki page for the Linux4nano project. Here is the project homepage, and here is a link to the project's mailing list. Linux4nano also has a fairly active IRC channel, #linux4nano-dev @ irc.freenode.net. IRC logs are located here. The iPhone Wiki is an excellent resource to use when researching, because much of the hardware and software aspects are similar to that of the iPod.
Feel free to add information and make changes! This is a wiki after all. Just make sure you are logged in before you try to edit.