The File You're Looking for is...

/templates/system/html/modules.php

This is where you can change the module titles from h3 to h2. Also from tables to not tables. I tried to copy this like normal to the template/html folder, but I get some error that makes me angry, so just forget about that.

I changed all the tables to divs too cause tables make me sad. I think pretty much the one that my site uses is like this:

function modChrome_xhtml($module, &$params, &$attribs)
{
 if (!empty ($module->content)) : ?>
  <div class="moduletable->get('moduleclass_sfx'); ?>">
  <?php if ($module->showtitle != 0) : ?>
   <h2><?php echo $module->title; ?></h2>
  <?php endif; ?>
   <?php echo $module->content; ?>
  </div>
 }
 <?php endif;
}