This is the wiki page for the Linux4nano project. Linux4nano has a fairly active IRC channel, #linux4nano @ irc.freenode.net for questions and comments. You will be immediately kicked if you ask support questions anywhere else. Here is the project homepage, and here is a link to the project's mailing list, but these two are rarely updated.
iBugger core v0.1 successfully running on 4G Nano! (as pictured to the right), also 2G Rockbox is for the most part stable