Right now, I'm finding my iPod files in ~/.gvfs/Phoenix's \iPod. But this has been hit and miss for me---sometimes that is a directory, and sometimes it looks like a broken link! But just now I unmounted the device, ran ls .gvfs, and found nothing; unplugged and replugged the device, ran ls again, and the files are there.
I have an iPod touch running iOS 5.0.1 connected to a laptop running Ubuntu 11.10.
EDIT: After some more research, I recommend the article at:
which states that:
"GVFS is the virtual filesystem for the GNOME desktop, which allows users easy access to remote data via SFTP, FTP, WebDAV, SMB, and local data via HAL integration, OBEX and others.
Attached resources are exposed via a URI syntax, for example smb://server01/gamedata or ftp://username:email@example.com/public_html, but are also mounted in the traditional manner under ~/.gvfs/ to make them available to older applications using standard POSIX commands and I/O."