Sync, Backup, iTMS, and Safari are all acting crazy... gah!

So many things aren't working and I have a sneaking suspicion that it's related to Keychain. In a nutshell:
Backup: bottom of main window in Backup says I'm in Trial Mode, limited to 100 megs, hasn't successfully completed a backup since November 4th, the error message says
"Transaction failed for unknown reason (100), Unable to complete backup at this time."
Unable to restore, says "Restore cancelled, Unknown destination."
iTunes: I can browse the iTMS and my already-subscribed-to podcasts update, but I am unable to purchase new songs or subscribe to new podcasts. I get an error message that says: "We could not complete your iTines Store request. An Unknown error has occured (-9813) There was an error in the iTunes Store. Please try again later." I can not sign in to the iTMS.
Sync: Locks up System Preferences and I have to force-quit.
Safari: I get errors when I go to Apple's website and my personalized Google page pertaining to the signer of the certificates is unknown.
.Mac Preference Pane: System Preferences locks up when I click on "Sync" tab, I have to force-quit, when I click on "iDisk" tab, I get this message: "There's a problem connecting to the iDisc server at this time. Please try again later. You may continue to work offline on your local iDisc."
Here's what I've tried to fix these problems:
I've tried to repair my Keychain - I got a message that said it was fine. I dragged my Keychain onto my desktop and restarted, no change. I've verified my .Mac password, I've rebuilt my permissions, I've followed the links sent to me by Apple Tech Support (none of which were pertinent), I've gone through all my logs looking for error messages and found nothing more than that (-9813) error, I've sent 10 emails to Apple asking for help and received nothing more than links to unhelpful articles and recommendations to try things I've already tried (and told them I'd already tried, by the way.)
The iTMS gift card my wife gave me is useless. Backup and Sync are inoperable. I'm really frustrated.
Does anyone out there have any idea what I can try next?
iBook G4 640 MB DDR SDRAM    

So here's another thing I tried to do - I re-installed the Security Update COMBO. Didn't help.
I also forgot to mention that I have two accounts on my iBook - one for home and one for work. I'm not sure how Keychain interacts with multiple accounts.

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