>>does anyone else see a lot of duplicated inodes after during a lot of
   >>disk access? (a lot == building the world or something equally as large.)
   >
   >Yes!  Or after untarring a large set of files, etc.
   >
   >fsck loves to find DUPs for me when I do this.

Are the file systems in question nearly full?  I remember some strange
lossage, possibly related to block relocating, that happened on full
or nearly-full file systems.

You might try changing `doreallocblks' (both definitions) in
vfs_cluster.c to `0' and see if it helps.