The module was ported to Drupal 7.

File: formtable.module

<?php
/**
 * @file
 * Defines 'formtable' and 'formrow' Form API elements.
 */

/**
 * Implementation of hook_element_info().
 */
function formtable_element_info() {
  $types = array();

  $types['formtable'] = array(
    '#input' => TRUE,
    '#theme' => array('formtable'),
  );

  $types['formrow'] = array(
    '#input' => TRUE,
    '#theme' => array('formrow'),
  );

  return $types;
}

/**
 * Implementation of hook_theme().
 */
function formtable_theme($existing, $type, $theme, $path) {
  return array(
    'formtable' => array(
      'render element' => 'element',
    ),
    'formrow' => array(
      'render element' => 'element',
    ),
  );
}

/**
 * Format a formtable element.
 */
function theme_formtable($element) {
  //Load the module CSS
  drupal_add_css(drupal_get_path('module', 'formtable') . '/formtable.css');

  $reset_element = reset($element);

  if (!empty($reset_element)) {
    $element = $reset_element;
  }

  if (empty($element['#type'])) {
    return $output = '';
  }

  $children = element_children($element, TRUE);
  if ($element['#children'] == '') {
    foreach ($children as $key) {
      $element['#children'] .= drupal_render($element[$key]);
    }
  }

  $output = "<div class=\"form-table\">\n";
  if ($element['#title']) {
    $output .= "<span class=\"table-title\">" . $element['#title'] . ':</span>';
  }

  if ($element['#description']) {
    $output .= "\n<div class=\"description\">" . $element['#description'] . "</div>\n";
  }

  $output .= "\n<table id=\"" . $element['#id'] . '"' . drupal_attributes($element['#attributes']) . ">\n";
  if (!empty($element['#caption']) && $element['#caption']) {
    $output .= "\t<caption>" . $element['#caption'] . "</caption>\n";
  }

  if ($element['#header']) {

    $output .= "\t<thead>\n\t\t<tr>\n";
    foreach ($element['#header'] as $col_header) {
      $output .= "\t\t\t<th>" . $col_header . "</th>\n";
    }
    $output .= "\t\t</tr>\n\t</thead>\n";

  }
  $output .= "\t<tbody>\n";
  $output .= $element['#children'];
  $output .= "\t</tbody>\n";
  $output .= "</table>\n</div>\n";

  return $output;
}

/**
 * Format a formrow element.
 */
function theme_formrow($element) {
  $reset_element = reset($element);

  if (!empty($reset_element)) {
    $element = $reset_element;
  }

  if (empty($element['#type'])) {
    return $output = '';
  }

  $children = element_children($element, TRUE);
  if ($element['#children'] == '') {
    foreach ($children as $key) {
      $element['#children'] .= drupal_render($element[$key]);
    }
  }

  $output = "\t<tr id=\"" . $element['#id'] . "\"" . drupal_attributes($element['#attributes']) . '>' . $element['#children'] . "</tr>\n";

  return $output;
}