Having problems with AT&T's data network on your iPhone? Or any phone for that matter? We are too, and so are other people up and down the west coast. It's been spotty for about the last 45 minutes, so far as we can tell -- let us know in comments if you're having issues (and where you're at)!
[Thanks to everyone who sent this in]Update:
Looks like we're back up (as of about 4:30PM PST, anyway).