Google Blog:
So Google got hacked, huh?

"Actually, we didn't. What happened yesterday was that someone sent the latest version of the MyDoom computer virus out for a spin, and this version flooded search engines like ours with automated searches."

What was up with that "Error-27" page?

"Yeah, we've just learned that our error message for blocked queries isn't the friendliest or most informative communication we've ever had with our users. Hey, we didn't think we'd ever have to show it to anyone..."
We need to order a copy of Defensive Design for the Web... ;)