I've put music on the iPod from over 4 diferent computers. The sync speed for the first 3 was really fast, but when I was adding some music from my desktop last night it took almost 45 minutes to do 82 songs. I've seen it very, I think its very USB 2.0 dependant. I also synced w/ firewire; though thats a little faster, its not a huge increase.
Thanks,
Arisian