A Benchmark of sorts -- Firewire vs. USB 2.0
With that in mind, I performed a simple test to determine the difference in update time with Firewire vs. USB 2.0. Specifically, my iTunes library contains 6719 items totalling 32.41GB. Of that total, I have 6 music videos which were uploaded onto my new 60GB iPod Video. In both cases, I did not load any photos onto the iPods. The upload times are:
5th Generation 60 GB iPod Video via USB 2.0 - 1 hour, 44 minutes
4th Generation 60 GB iPod via Firewire - 1 hour, 22 minutes
For what it's worth, I performed the test using a Powermac G5, Dual 2gig, with 4gigs RAM, running OSX 10.4.2 and iTunes 6.0.1.
Hope this helps.