The Battlefield Heroes Website has a status report on beta testing of DICE's upcoming free multiplayer shooter. Here's a portion:

As you will have seen in our recent Twitter post, we simply never expected that so MANY of you would be THIS keen to get into the Beta, at exactly the same time.

Imagine the web servers to be the two-man army of Royals and everyone else the horde of Nationals storming the lines. Perhaps they got a bit scared ;)

We want to make sure that everyone (re-)joining the Beta gets the best playing experience we can possibly offer, so at this time, although it was a hard decision, we bit the bullet and decided to temporarily keep the Beta site down.

This will let us properly investigate and bring in some reinforcements.

The investigation will be taking us through the night and likely occupy some of our morning, so unless your day just started, it is safe to go to bed soon, get some rest and think up strategies to apply on the battlefield tomorrow.