Improving the diff engine
http://www.holomind.de/phpnet/diff.src.php
http://de.tikiwiki.org/dox-head/html/diff_8php-source.html
http://cvs.sourceforge.jp/cgi-bin/viewcvs.cgi/pukiwiki/pukiwiki/diff.php
http://search.cpan.org/~nedkonz/Algorithm-Diff-1.15/lib/Algorithm/Diff.pm
gnu diff
diff in perl
http://c2.com/cgi/wiki?DiffAlgorithm
http://search.cpan.org/dist/Algorithm-Diff/
http://www.informatik.uni-trier.de/~naeher/Professur/courses/ss2002/data/xml/xdiff.pdf
http://www.bsi.bund.de/fachthem/egov/download/4_Barriere.pdf
http://osdir.com/modules.php?op=modload&name=News&file=article&sid=203
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