Although the diffs side is already being discussed here (http://drupal.org/node/533218), I'm interested in the filter side. I'll do a bit more looking into how to hack the code together soon - this could be a disaster, as I'm not a coder :)

Basically, a dynamic filter for views structed as: "Comment modified CCK field" with a multi-select of all cck fields (preferably just the ones with the "Can be modified by comment CCK" option checked.

Thoughts?