kukident close...
You also need a capital i there...without that, even if the folder is marked visible, it still won't show up in the Finder. Heh, I used this in my user folder to hide some folders from the Finder but that I use in the Terminal.
Aleran - if you did install the Developer tools, then do these commands in the Terminal application:
/Developer/Tools/SetFile -a vI /Volumes/name_of_iPod/iPod_Control
/Developer/Tools/SetFile -a vI /Volumes/name_of_iPod/iPod_Control/Music
(Note: that's an uppercase i, not an L)
Um, next part is tricky. Inside the music folder is all those folders that actually hold the mp3 files...you have to make all of them visible too. I dunno if they're all the same on all iPods, mine are named F00 through F19. Unfortunately, you can't set the file attributes for a bunch of folders, so you have to go through and do them all one by one, but after you do all of that, you should be able to see all the mp3 files in the Finder. Same command as above to do all those.