It is nice, but having implemented something like this myself at work recently, this looks eerily familiar and some things about it bug me.

For example, why is ReflectionClass not used (I'm guessing PHP 4 compatibility)? Particularly because class_exists can cause major headaches if you use the default autoloader, see https://bugs.php.net/bug.php?id=52339

There's also little information available from outside the router; an invalid class/method uses die without giving you an option to check for it and handle it some other way. I also don't immediately see any special handling for not allowing magical methods to be called

Definitely a good start for personal projects though, just needs some spit and polish