I'm sure it's a simple one-liner, but I can't seem to find it.
How can I use a different layout file for a particular action?
Update: This worked for me, thanks!
// Within controller
$this->_helper->_layout->setLayout('other-layout') //other-layout.phtml
//Within view script
<?php $this->layout()->setLayout('other-layout'); ?>
From inside a Controller:
$this->_helper->layout->setLayout('/path/to/your/layout_script');
(via these docs)
EDIT: I should mention that the path is relative to whatever your layout directory is (by default, it's application/layouts/scripts/
)