Here's an extension of my previously posted example (http://fuelphp.com/forums/topics/view/460)
I documented a process of using javascript (jQuery 1.6) with a REST controller and showcase it as a method of checking a users login/password without causing a page refresh. The example uses json as the data type.
The notes are posted here: http://saaboke.com/?p=257 and the code is available here: https://github.com/jsidhu/FuelPHP-Auth-AJAX
Feedback/tips welcome.
-js