Activity Monitor showed the iMac was idling at ~6%. The next time it froze, I looked at the Console log on screen and noted nothing usual was happening when it froze. To see what was happening, I turned off the screen saver and energy saver, left the CPU always on, opened the Console log and Activity Monitor window (selected highest CPU usage column), left iTunes running, and waited.
I found that this control environment NEVER froze, so I knew I wasn't having a hardware issue, but my migrated account continued to spontaneously freeze periodically. To narrow the field of issues, I built a clean partition with Leopard on the iMac and proceeded to install my old apps and data just to use as a control environment. I migrated my old G5 Tower apps/accounts/data to my new 24" 2.8GHz iMac in early November, and had periodic freezes (from 5 minutes to 3 days) that I was having trouble resolving.
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