Unable to sync, "unknown error (-50)"

I have been having this problem for a couple months now, and cannot find anything in the forums- even the guy at the Genius Bar wasn't sure what to do- I'm HOPING someone here can help.
A while ago my old ipod photo stopped syncing. It would put up an error message "The iPod 'photo' cannot be synced. An unknown error has occurred (-50)."
I played around with it for a little while, and found that if I turn off photo syncing the error goes away, and it syncs my music just fine. But as soon as I turn it back on, I get the same thing.
Then I found that I get the same error with my (brand new) 80gb ipod video. And with my first gen ipod nano.
I tried rebuilding my iphoto library, but that didn't make a difference.
Then I got a whole new computer- a new intel iMac. I did not use the migration assistant. I installed all apps fresh. I did use target disk mode to copy my music folder and my pictures folder from the old computer to the new one.
And I STILL have the same error, and can't find any information about it.
What is it?!
It's on 3 ipods, 2 computers... obviously has something to do with syncing photos... I tried rebuilding the iphoto library...
What else can I do to troubleshoot? I'm about to make a new user and try that...
Please help!
Thanks!

Ok, so I created a whole new user called Test.
I hooked up the nano, and it asked if i want to erase and sync, or transfer purchases.
I transferred purchases, so then I had a couple hundred songs in my itunes library.
Then I synced the nano, and got the usual "this nano syncs with another library to you want to erase everything and sync with this one" and i said yes.
It worked.
Then I went and turned on photo syncing (even though I have no photos in this new user account).
It worked.
Then I copied a few folders of pix from my regular user account into the test account's Pictures folder. Then opened iphoto and said 'import to library'. So it added all the pix in the pictures folder into iphoto.
I tried to sync the ipod again- it asked if I wanted to replace all pix with the new ones (the same as the music warning)- I said yes.
And hit sync- and it worked.
Soo... I guess that means the problem is either somewhere in my thousands of photos, or maybe in a pref file for my user?
Maybe the next step is to import ALL my pix from the old account. Then if THEY sync, it must be something in the user account itself?! Not sure if that logic works.
But I don't think my 4gb nano can hold all my pix, and I don't really want to erase my whole 80gb video...
Anyone have any other ideas? Where are the Apple helper people? The only people responding are people saying 'i have the same problem'. Can we get some help around here?
Please?

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