v1.0 of plugin: This is the "lite" version of Prestosoft's Examdiff Pro, a visual file/folder difference/comparison utility. Optional command-line switches are available in the readme included on the menu. Visit their site for a screenshot and more notes. It's no longer being developed, IIRC.
-Easy editing of the first and second files. ExamDiff will spawn any editor (configurable by the user) with the first or second file, and line number option (available for editors that support this, through ExamDiff variables: $FILE (first or second file name), $CURFIFF (number of line at which the current difference starts), and $CARET (number of line where the caret is located)). -Saves the file differences in a standard UNIX DIFF file. -Easy navigation through the differences via "Next Difference"/"Current Difference"/"Previous Difference" buttons and hot keys or via a list box of all the differences. -Allows the copying of text from the comparison panes via drag and drop, a hot key, or a right button pop up. -Simple "Search" command to search for strings in the comparison panes. It also remembers a user specified number of most recent searches. (etc.)
Prestosoft site (Full plugin, no other downloads needed.)