[Chris M]

Open admin/functions.php
Find:

	// do posts from ignored users
	if (($ignore[$post[userid]] and $post[userid] != 0)) {
		eval("\$retval = \"".gettemplate("postbit_ignore")."\";");
	} else {
		eval("\$retval = \"".gettemplate("postbit")."\";");
	}

Replace with:

	// do posts from ignored users
	if (($ignore[$post[userid]] and $post[userid] != 0)) {
		eval("\$retval = \"".gettemplate("postbit_ignore")."\";");
	} elseif ($bbuserinfo[usergroupid]==X) {
		eval("\$retval = \"".gettemplate("postbit_contributor")."\";");
	} else {
		eval("\$retval = \"".gettemplate("postbit")."\";");
	}

(Replace X with the id of the contributor's postbit)

Satan