Having promised that I'd look into a tutorial for Zend_Auth ages and ages ago, I've finally managed to get one together...
Note that this tutorial only covers Zend_Auth; Zend_Acl will have to be the topic for another one at some point in the future!
As always, if you have any comments (especially corrections!) then please let me know. Who knows? Maybe we won't need 30 revisions to catch all the typos this time!
That didn't take long! David found some typos within 15 mins!