Error--iTunes could not back up because the iPod disconnected

Today for the first time I am beginning to get an error message every time I attempt to sync my iPod Touch. When I click on Sync, it appears to be going through all the proper sequence of steps. In the window at the top, it says it's starting the sync, backing up, preparing to sync, then syncing music, contacts, etc. Then when it gets to "finishing sync," a window pops up that says, "iTunes could not back up the iPod 'myname' because the iPod disconnected." Yet, in the sidebar under devices, it still shows up as being connected and I can click on any of the content areas in the sidebar and see the titles. There is still an Eject button to the right of the battery level indicator.
I've seen other similar threads about disconnections, not not this exact problem. I tried deleting all the iTunes and iPod plists in Preferences, but that didn't help.
Why did it just start doing this now and what can be done to fix this? I have iOS 4.2.1 on the device and recently updated to OS 10.6.6. Could that new system update of iTunes have created the problem?

I have the same problem tonight for the first time. I restarted the iPod and my powerbook then used disk utilities to repair disk permissions then tried again. It got stuck on step 4 13 of 13 songs. Each time I try it gets a few more songs over before it freezes. Then I get an error message; Unknown sync error
0xE800400B.
While it is syncing the "s" on "slide to cancel" on the iPod screen is flashing. Finally iTunes freezes and I have to "force quit".
In previous tries the iPod turned off yet it still appeared on the list of devices in iTunes even after getting the "unknown error" message.

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