Since Symfony 2.0.x came out the new site is: http://symfony.com/ and for the introductory tutorial you can see it here: http://symfony.com/get_started or directly here: http://symfony.com/doc/current/quick_tour/the_big_picture.html
It is easier to follow since most or maybe all the problems in the 1.2/1.4 tutorials are gone (No more going crazy trying to understand it)
