We've started getting a few emails regarding the authentication servers. Apparently there are issues again tonight! None of us on staff were actually running into any trouble, so we assumed it was just an anomaly until we saw this thread. From reading through it, it appears that the reason none of us on staff had problems was because we had all converted to Battle.net accounts, and this time around only those that haven't converted are running into problems. Fancy that!
Blizzard is aware of the problem, and seem to be actively investigating it. Keep an eye on the linked thread for updates, and if you want a quick fix to get on and play the game tonight... just convert to Battle.net and you'll be on in no time.
And for the record, when you write in about server outages? If we haven't posted about something yet, it doesn't help you to accuse us of being paid off by Blizzard. We can dream of a bright future where Blizzard showers us with money, but no, that hasn't happened yet. It's much more likely that we just don't know.