Symfony blog have a very interesting article to help you create an iPhone version of your website. This is made easy with the new native support for different mime types introduced in Symfony 1.1.
iphone-symfony.png

symfony 1.1 introduces native support for different formats and mime-types. This means that the same model and controller can have different templates based on the requested format.
Thanks to the new format support in symfony 1.1, developing websites that supports Web Services, API or the iPhone has never been easier. Supporting a new format is as easy as creating a new set of templates