in reply to Finding Redundant Files
dupfinder and dupseek.
Being the original author, I am glad of it :-)
You can download the latest version from my web site. It only finds exact duplicates, so you could use something along the lines of the trick suggested by Willard B. Trophy to avoid comparing tag info.
As a final note, dupseek does indeed recurse subdirectories, using File::Find.
Cheers Antonio