Bueno a pesar de que lo programe sin el estandar que utiliza moodle (sin get_record_select, etc)

aqui te dejo como quedo la funcion print_course() en course/lib.php

function print_course($course, $highlightterms = '') {

global $CFG, $USER;

if (isset($course->context)) {
$context = $course->context;
} else {
$context = get_context_instance(CONTEXT_COURSE, $course->id);
}


// MI CODIGO



$rs = mysql_query("SELECT * FROM mdl_log WHERE course=".$course->id." AND action LIKE '%add%' order by id desc limit 1 "); // obtengo la ultima fecha de cuando se agrego algun recurso
while($rs2 = mysql_fetch_array($rs))
{
$fechaMaterial = $rs2[time]."<br>";
}



$rs3 = mysql_query("SELECT * FROM mdl_log WHERE userid=".$USER->id." AND action like '$view%'"." AND course=".$course->id." order by id desc limit 1"); // obtengo la fecha del ultimo acceso del usuario al curso
while($rs4 = mysql_fetch_array($rs3))
{
$fechaVista = $rs4[time];
}

if ($fechaMaterial > $fechaVista){ // comparo si la fecha de acceso es menor a la fecha que se agrego el recurso
$mensaje = " <img src=\"{$CFG->pixpath}/bg/news.png\" title=\"".get_string('userhashiddenassignments', 'role')."\" alt=\"".get_string('hiddenassign')."\" class=\"hide-show-image\"/>";
} // si el alumno no ha ingresado al curso, entonces muestro la imagen (nuevo)
else
{
echo "";
}

//


$linkcss = $course->visible ? '' : ' class="dimmed" ';

echo '<div class="coursebox clearfix">';
echo '<div class="info">';
echo '<div class="name"><a title="'.get_string('entercourse').'"'.
$linkcss.' href="'.$CFG->wwwroot.'/course/view.php?id='.$course->id.'">'.
highlight($highlightterms, format_string($course->fullname)).$mensaje.'</a></div>';


/// first find all roles that are supposed to be displayed

if (!empty($CFG->coursemanager)) {
$managerroles = split(',', $CFG->coursemanager);
$canseehidden = has_capability('moodle/role:viewhiddenassigns', $context);
$namesarray = array();
if (isset($course->managers)) {
if (count($course->managers)) {
$rusers = $course->managers;
$canviewfullnames = has_capability('moodle/site:viewfullnames', $context);

/// Rename some of the role names if needed
if (isset($context)) {
$aliasnames = get_records('role_names', 'contextid', $context->id,'','roleid,contextid,name');
}

// keep a note of users displayed to eliminate duplicates
$usersshown = array();
foreach ($rusers as $ra) {

// if we've already displayed user don't again
if (in_array($ra->user->id,$usersshown)) {
continue;
}
$usersshown[] = $ra->user->id;

if ($ra->hidden == 0 || $canseehidden) {
$fullname = fullname($ra->user, $canviewfullnames);
if ($ra->hidden == 1) {
$status = " <img src=\"{$CFG->pixpath}/t/show.gif\" title=\"".get_string('userhashiddenassignments', 'role')."\" alt=\"".get_string('hiddenassign')."\" class=\"hide-show-image\"/>";
} else {
$status = '';
}

if (isset($aliasnames[$ra->roleid])) {
$ra->rolename = $aliasnames[$ra->roleid]->name;
}

$namesarray[] = format_string($ra->rolename)
. ': <a href="'.$CFG->wwwroot.'/user/view.php?id='.$ra->user->id.'&amp;course='.SITEID.'">'
. $fullname . '</a>' . $status;
}
}
}
} else {
$rusers = get_role_users($managerroles, $context,
true, '', 'r.sortorder ASC, u.lastname ASC', $canseehidden);
if (is_array($rusers) && count($rusers)) {
$canviewfullnames = has_capability('moodle/site:viewfullnames', $context);

/// Rename some of the role names if needed
if (isset($context)) {
$aliasnames = get_records('role_names', 'contextid', $context->id,'','roleid,contextid,name');
}

foreach ($rusers as $teacher) {
$fullname = fullname($teacher, $canviewfullnames);

/// Apply role names
if (isset($aliasnames[$teacher->roleid])) {
$teacher->rolename = $aliasnames[$teacher->roleid]->name;
}

$namesarray[] = format_string($teacher->rolename)
. ': <a href="'.$CFG->wwwroot.'/user/view.php?id='.$teacher->id.'&amp;course='.SITEID.'">'
. $fullname . '</a>';
}
}
}

if (!empty($namesarray)) {
echo "<ul class=\"teachers\">\n<li>";
echo implode('</li><li>', $namesarray);
echo "</li></ul>";
}
}

require_once("$CFG->dirroot/enrol/enrol.class.php");
$enrol = enrolment_factory::factory($course->enrol);
echo $enrol->get_access_icons($course);

echo '</div><div class="summary">';
$options = NULL;
$options->noclean = true;
$options->para = false;
echo highlight($highlightterms, format_text($course->summary, FORMAT_MOODLE, $options, $course->id));
echo '</div>';
echo '</div>';
}

bueno uno de los objetivos de mi tesis de grado es publicar el codigo y tratar de que lo acepten, no te preocupes que como sea yo publico el codigo