<catalog_product_view> <reference name="product.info.tabs"> 
<block type="review/form" name="product.review.form" as="review_form" /> <action method="addTab" translate="title" module="review">
 <alias>reviews</alias>
 <title>Product's Review</title>
 <block>review/product_view_list</block>
 <template>review/product/view/mylist.phtml</template>
 </action>
</reference>
 </catalog_product_view>

<?php
$layout = Mage::getSingleton('core/layout');
$block = $layout->getBlock('content')->getChild('product.info')->getChild('info_tabs')->getChild('review_form');
echo $block->toHtml();
?>