I came to this component page from your comment on the http://bakery.cakephp.org/articles/view/remember-me-a-component-to-add-upon-basic-auth bakery article in the hope your solution would work but I am having no joy.
Not sure if I'm being daft but it seems you missed out two things above:
1. Need to add 'RememberMe' component to AppController
2. Add a 'User.remember_me' checkbox to the login form
Despite doing these things the RememberMe->check() function keeps returning at the following point.
if (!is_array($cookie) || $this->Auth->user())
A cookie never gets created ... any ideas?