Weird :/ I don't think we should automatically redirect the user, we're currently looking for a way to display all the available languages :) I'll try to reimplement the error.php code, it's really silly.
Your browser sends your language, so why ask it? take a look at $_SERVER[HTTP_ACCEPT_LANGUAGE] mine prints: "pt,en-gb;q=0.7,en-us;q=0.3"
It will not work. People know that the translated versions are lagging behind and they get better service wit the English version. We had a lot of discussion about this, when we started to implement language autosuggestion on PHP.net. This is why there are so many options to test for (see the My PHP.net page). Depending on the accept language setting is not the right behaviour.
Goba
