Well, a full Time Capsule backup in hand I upgraded to Mac OS X 10.5.3.
Unfortunately, after the install the machine seemed hung during the shutdown process.
After a forced shutdown and a restart, it seems that BOINC was running, but that BOINCManager wouldn’t work. Killed that.
Now it seems that CPU is being chewed up by
/System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker MDSSyncScanWorker com.apple.Spotlight.SyncScanWorker
man mdworker says:
mdworker is the metadata server worker process. It is used by mds to scan and index files as a volume is mounted or a file changes.
There are no configurations to mdworker, and users should not run manually.
Which isn’t particularly revealling. I guess I’ll wait and see if it finishes anytime in the near future. On the plus side, the Airport reception seems better.