In controller:

$this->Auth->user() 
$this->Auth->user('field_name') 

In view:

$session->read('Auth.User') 
$session->read('Auth.User.field_name')

In controller:

var $pageTitle = 'My Page Title';
$this->pageTitle='My Title';
$this->set('title', 'My Title'); 

In view:

$this->pageTitle='My Title';

In view and controller:

debug($this->params);

Array
(
    [pass] => Array
        (
            [0] => bbb
            [1] => cc
            [2] => dd
        )

    [named] => Array
        (
        )

    [controller] => documents
    [action] => aaa
    [plugin] => 
    [form] => Array
        (
        )

    [url] => Array
        (
            [url] => documents/aaa/bbb/cc/dd
        )

)