Show Out of Stock items after in stock items

Magento display on any pages out of stock products mixed with products in stock. In some case it useful to have out of stock products at the end of list.
"Display products out of stock last" means that out of stock products go to the end of list.
This is a very important from SEO point of view.

Features:
- products out of stock at bottom of the category lisitng page
- products out of stock at bottom of the quick search result page
- products out of stock at bottom of advanced search result page

It works only if you activate the Stock Option on Magento admin settings:
Admin > System > Configuration > Inventory > Display Out of Stock Products: YES

After installing this extension, please reindex data:
Admin > System > Index Management