After getting prodded by Erik Hatcher, I went ahead and added another subclass to SVN::Notify. This one adds a pretty colorized diff to the message, instead of just the plain text one. See an example here. I’ve also added links from the lists of affected files into the diffs in the HTML and new HTML::ColorDiff layouts.
Update: And now I’ve released SVN::Notify 2.21 with a few minor fixes, including XHTML 1.1 compliance.
Looking for the comments? Try the old layout.