in reply to Replace duplicate files with hardlinks
This is a common problem and your solution is not dissimilar from others. There is a nice section on Wikikpedia about the various duplicate finders and linking tools: fdupes.
As the author of one of the tools (fdf) I have a vested interest and I can say that it's easy to make something fast, it's harder to make it fast and reliable. I've also had a conversation with the author of fslint - there are more than a few land-mines out there! For example lots of operating systems have primitive file-systems that don't do hard-links...
Anyhow it's nice to see another version and it's always fun to try benchmarking them!
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Cool Uses for Perl