Helper function to get real module names.
function _search_get_module_names() {
$search_info = search_get_info(TRUE);
$system_info = system_get_info('module');
$names = array();
foreach ($search_info as $module => $info) {
$names[$module] = $system_info[$module]['name'];
}
asort($names, SORT_STRING);
return $names;
}