Ok... your iPod is just some sort of storage device. The same thing goes with CDs , Memory Sticks, Digital Cameras, etc. Hence, think of it as a hard drive.
Hard drives are mounted into your filesystem so that you can view its content and possibly modify it. Hence, at bootup, Linux mounts your root partition so that you can view your files and programs and write to them.
The same thing happens with other units. To be able to use them, you have to make sure they are there somewhere in your filesystem. Take a CD for instance. FIrst you mount the CD
mount -t vfat /dev/cdrom /mnt/cdrom
Then you can go to /mnt/cdrom and you will find all the content of your CD ROM. Now... notice that the mount was too large and maybe you'd like to only say mount /mnt/cdrom or maybe mount /dev/cdrom. Then, as some things are missing (type and device), your mount command will look in the file called /etc/fstab for more information. This information will be provided by the fstab which will help your system mount the unit.
Now... you have your iPod entry in your fstab. Now mount it (mount /mnt/iPod or whatever the directory was called). You should be able to see something in there :P
And btw.. no need to restart in this kind of things...