They say here that Google Reader has moved on from Google Labs, which I guess means it is no longer Beta:
Official Google Reader Blog: Breaking up isn't hard to do
I'm a bit befuddled by the fact that GMail is still Beta. Talk about perpetual Beta, GMail is the poster child for that. Google needs to step up and take full responsiblity for GMail as a non-Beta app and quit the hedging already. C'mon, even *flickr* is out of Beta for Pete's sake!