iPod video will charge over firewire.
Oddly, someone brought one baqck to our shop thinking it was faulty. I plugged it in with USB, and it just flashed a battery logo at me. Restting made no difference, and it wouldn't show on the desktop/iTunes/ASP/Disk Util. I plugged it into a firewire cable and it booted straight up! Warned me it wouldn't work over firewire, but was absolutely fine after that. Very odd indeed....