Compare multiple files in different folders with one click
FileMerger and other “Diff-Tools” normally compare only two files at once. Good programs (like BBEdit) can additionally compare the contents of two folders.
Today I had to compare 673 files in two folders with each other. Now I was looking for a tool doing this for me: I found KDiff3!
KDiff3 can not only compare a huge amount of files in two different locations, it also compares three files with each other at once. KDiff3 is easy to use and has a functional GUI, which looks like a Win 3.11 GUI 
You can download that tool for Mac Universal (PPC/x86), Linux i386 and Windows i386 from its homepage at: http://kdiff3.sourceforge.net/
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Thanks for the tip, this is really useful!
THank you 4 ur hint