Currently, viewlog.pl runs comparisons another log.  This is okay if you have a previous entry in the log to compare it to (if your logs haven't been cleaned up or a good log exists before the change).

It would be better, if the log had a copy of info before the change, and after.  If that is the only log entry you select to compare, it will show you a before and after and highlight the changes.  If you select a second log entry, then it would show you a comparison between the two entries.

This would make the compare feature infinitely more useful.