Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	2008-12-10 23:22:30.000000000 +0100
+++ wp-admin/includes/template.php	2009-01-02 14:32:54.000000000 +0100
@@ -181,7 +181,13 @@
 			case 'posts':
 				$attributes = 'class="posts column-posts num"' . $style;
 				$output .= "<td $attributes>$posts_count</td>\n";
+				break;
+			default:
+				$output .= "<td $attributes>";
+				$output .= apply_filters('manage_categories_custom_column', $column_name, $qe_data->term_id);
+				$output .= "</td>";
 		}
+
 	}
 	$output .= '</tr>';
 
@@ -1867,6 +1873,11 @@
 					$r .= 0;
 				}
 				$r .= "</td>";
+				break;
+			default:
+				$r .= "<td $attributes>";
+				$r .= apply_filters('manage_users_custom_column', $column_name, $user_object->ID);
+				$r .= "</td>";
 		}
 	}
 	$r .= '</tr>';