IP phones are great example where you can use EoIP to get simpel config and secure phone lines from phone to PBX.
a other good use of EoIP are when you need to move IT resources such as servers or other hardware that can not be moved in one fell swoop. When EoIP tunnel is up you can move client PC's and get IP from DHCP server on other side of your EoIP tunnel and still use all resources on other side.
