A quick note when using sudo for ejecting ipod's.

Assuming you got access to your ipod by mounting and such it is
required to 'eject /dev/ipod' for the 'do not disconnect'
message to go away. Changing permissions on /dev/ipod to 777
doesn't seem like the best way, and changing the group on scsi
disks doesn't seem to work.

gtkpod on default does call eject, but with 'user' permissions
that's never going to work. Therefore I patched gtkpod
to call eject_ipod.sh instead. This scripts runs

sudo eject <ipod device>

where 'ipod device' is passed along from gtkpod. So up to here
no changes are required. However you want your sudoers file to
be setup correctly.

Assuming the default gentoo sudoers, all that is required to add is

# Ipod ejecting
%ipod           ALL = NOPASSWD: /usr/bin/eject

Here %ipod is the group ipod, which I added to the system (and
added my user to). This can be replaced by your user for example

oliver           ALL = NOPASSWD: /usr/bin/eject

for just one user.
The NOPASSWD is key here, we don't want password popups while
ejecting our iPod's.

For better idea's contact me at oliver@are-b.org