iOS devices do not have mount points because the computer does not view them as data disks. Instead, data is sent via usbmuxd, which connects directly via USB. There is a library called libimobiledevice that uses the reverse information developed by the jailbreak community so that you can communicate with iDevices (this does not require jailbreak, if you do not want full access to the file system, the jailbreak was just motivated to reverse engineer). According to their homepage, you will also need libgpod to sync music and video.
If you say "iPod", you mean iPods other than iOS, not iPod touch, then they are mounted like regular hard drives. They will appear on your desktop if you use disk mode or enable the option in iTunes, otherwise you can get them through the command line.
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