Get all node types and information on their fields.

gistfile1.php

<?php

foreach (array_keys(field_info_instances('node')) as $node_type) {
  $fields_info = field_info_instances('node', $node_type);
  print $node_type . '</br>';
  foreach ($fields_info as $field_name => $value) {
    $field_info = field_info_field($field_name);
    $field_name = $field_info['field_name'];
    $type = $field_info['type'];
    $module = $field_info['module'];
    print "&nbsp;&nbsp;$field_name</br>";
    print "&nbsp;&nbsp;&nbsp;&nbsp;type:   $type</br>";
    print "&nbsp;&nbsp;&nbsp;&nbsp;module: $module</br>";
  }
  print '</br>';
}