As already mentioned I’am playing around with Symfony 2 at the moment and of course I want to use my favorite IDE: PHPStrom.
I was not surprised that integation into PHPStorm is very good:
So for setting up follow this guide.
Also a plugin is available but for me it does not bring that much extra use.
For me the only pitfall was that I was not used to copy assets to the webfolder by assets:install (not needed when using assetic). And this took me quite a while.
But still form my point of view there is at the moment no better IDE for PHP development than PHPStorm, also when working with Symfony 2.