I never got a chance. On re-install, the computer wouldn't boot until I removed the drive. I dropped it into a USB case and stuck it on my laptop (which is running Vista). It churned away for quite a bit and then showed up in Disk Management as partitioned, but unformatted. I put it back in the desktop to extract data using Stellar Phoenix (a great program -- I wrote about it in another thread). When it was done, I ran AIDA, which reads the SMART data from the drive. It reported no errors and normal parameters (and this was after a good 8 hours or so of continuous use during the data extraction), so I figured it was probably safe for the time being. I rebooted. Windows ran the chkdsk routine on its own and performed extensive repairs. Once it booted into the desktop, the drive was back with almost all of the files intact.

I don't know whether it was Vista, Stellar Phoenix or chkdsk (or some combination of all three) that fixed the disk, but it's back.