Sure. In your
forumdisplay.php file, replace this:
PHP Code:
eval("dooutput(\"".gettemplate('forumdisplay')."\");");
...with this...
PHP Code:
$shout = $DB_site->query_first("SELECT u.username, s.userid, s.shout_text, s.timestamp FROM user u, shoutbox s WHERE u.userid = s.userid ORDER BY s.timestamp DESC LIMIT 1");
$shout[timestamp] = vbdate('n-j-y, g:i:s a', $shout[timestamp]);
$shout[shout_text] = bbcodeparse($shout[shout_text]);
eval("\$the_shoutbox .= \"".gettemplate("forumhome_shoutbox")."\";");
eval("dooutput(\"".gettemplate('forumdisplay')."\");");
Whatcha got in mind, out of curiousity? I'd be interested to see where you put it.

You'd probably want to change the HTML in the forumhome_shoutbox template, however...it's designed specifically for the mainpage, what with the colspan and all.