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https://fishpig.co.uk/magento/wordpress-integration/customising-the-design-and-theme/


0) create a new template for the blog index: /template/page/blogindex.phtml

1) open /app/design/frontend/base/default/layout/wordpress.xml

2)  change

<wordpress_default>
		<reference name="root">
			<action method="setTemplate"><template>page/2column.phtml</template></action>

TO 

<action method="setTemplate"><template>page/blogindex.phtml</template></action>