This question and answer explains how to access a plugin's settings from elsewhere in the plugin's PHP code.
How would I access these settings from within a template? Or this impossible and I'd have to pass the values into the template when rendering it? ie, in a Controller action:
$settings = craft()->plugins->getPlugin('myPlugin')->getSettings();
$templateVars = array(
'foo' => $settings->foo,
);
$this->renderTemplate('myPlugin/templateName', $templateVars);