This tool is a replacement for GNU wdiff that provides the ability to generate context and unified diffs based on the wordwise diff. It's written in Perl instead of C, so it's both shorter and slower. It doesn't have as many options as wdiff, but it provides some others.
You can find the man-page here or you can generate it from the embedded pod in adiff.
The main reason I wrote adiff was so I could get meaningful diff mails from subversion when Word documents are checked in. To make this happen, I tie together run-mailcap, antiword and adiff. Since it uses run-mailcap, the system should work for arbitrary binary files.
Regarding the files posted below: