Up to now you defined an “order by” clause with several columns in the following way:
$this->User->findAll(null, null, 'User.lastname ASC, User.firstname ASC');
In the coming release of CakePHP that will no longer work, it causes an “Unknown column” error. You have to use a new syntax:
$this->User->findAll(null, null,
array('User.lastname' => 'ASC', 'User.firstname' => 'ASC'));
Update (2006-02-16): The statement above could be simplified in the following way:
$this->User->findAll(null, null, array('User.lastname', 'User.firstname'));
You only have to use the key/value syntax if you want a descending order:
$this->User->findAll(null, null, array('User.lastname', 'User.firstname' => 'DESC'));
Thanks to PhpNut for that hint.

Happy now? ;-P
Yeah, I like the new syntax :)