iPhone SDK requires OS 10.5.
10.5 installer thinks my FS is messed up.
It thinks it can fix it.
It spends hours and hours in "less than a minute remaining".
I kill it.
I wipe the drive.
I restore from backup.
It "restores" the 865,000+ files in about six hours.
It then says it is "completing the restore".
This seems to be where it gives the right permissions and ownership to all 865,000+ files.
Based on the speed it is going by, I estimate I will get to use my computer again on Tuesday or Wednesday.