Open your local.xml file and paste the code below, depending on which template you wish to switch to, just edit 1columnphtml > 2columns-leftphtml > 2columns-right.phtml
<review_product_list>
<!-- Mage_Review -->
<reference name="root">
<action method="setTemplate">
<template>page/1column.phtml</template>
</action>
</reference>
</review_product_list>
Its that simple , find more local.xml trick on our home page local.xml topic. As always please leave your comments below.