Raoul's plugin isn't simple and with fairly complicated sql query using clauses like "LEFT OUTER JOIN", "WHERE", "ORDER BY" and "LIMIT" etc.
Now I have rewritten it from the ground up getting hints from WordPress's \wp-admin\index.php file. This is the file first loaded when you logged in. I can see recent comments listed there.
My plugin is now very simple with 2 reusable functions written, one to truncate the comment, using PHP's explode and implode, and the other one to calculate time different between when comment was posted and "now". I can find good use of these functions elsewhere. Raoul's plugin uses "SUBSTRING(comment_content,1,$src_length) AS com_excerpt" which is far too hard for beginner like me.
On the sidebar I have put them side-by-side for a test. My [tag]plugin[/tag] is named [tag]ezComments[/tag].
PS: there is an issue on the time different my time zone here and where the server is located. I could manually adjust to this but there should be a better way I guess.