Could not complete iTunes Store request. An unknown error occurred (-4)

Apologies if this is a FAQ, these forums are a little hard to search.
Mac OS 10.5.1
iMac 2.8
ITunes 7.15
iPod
IPhone
I recently upgraded to the Mac above, added Lepoard, and could sync my music successfully. Then added an iPhone to the list in the last week or so, and also could sync. However, started to get error messages for many of the music in the library, which seemed to require me to re-authorize using some of the older account names I purchased under. Any attempt now to re-authorize the music, or re-authorize (or de-authorize) the computer, with any of the accounts, gives me the messsage in the subject line.
"Could not complete iTunes Store request. An unknown error occurred (-4)"
So now I have about 30 gigs of uplayable music. Not happy. Any ideas ?

I just synced my iPhone and got some errors stating that a few songs weren't authorized to play (it synced fine yesterday). I decided to deauthorize all computers (since I forgot to deauthorize two older ones a while ago). When I tried to reauthorize, I kept getting the -4 error. I had to try at least 5 times before it finally worked. Apple's servers must be getting hammered.
I'm not sure if this matters... but on the last attempt that worked, I went to the menu-Store-Authorize Computer (instead of clicking on a iTunes purchase to authorize).
<My address book (synced to Yahoo) is also unable to sync with my iPhone suddenly, too. Something weird is going on>

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