Felix Geisendorfer has posted a new blog entry he's been promising for a while now - a look at using Exceptions in a CakePHP application:
First of all. Why did I decide to experiment with exceptions in CakePHP? Well, Object::cakeError() does an ok job at providing me with a way to render some sort of internal error while I'm debug mode. However, I think that is what its really meant for, and its not the way to go for rendering errors to the user directly. [...] [All of] these things can be addressed by using PHP5s support for custom Exception classes quite elegantly.
He includes an example of the exception handling in action - an AppError controller that extends the ErrorHandler and an AppException class that extends the normal Exception class for some customized methods. Example usage is also included, showing how to check things like the Subversion version of a file and checking properties of objects.