My friends in Osaka (San Fran) felt it.
I live in Ogaki (Kansas). There was a mild panic in the mall, and our trains stopped for a few minutes.
Folks in Tokyo are largely shaken but not terribly affected (Boston/DC ish).
Miyagi/etc (Maine-ish) got a wee bit whacked by a tsunami. They had a few minutes of warning. Reports will come in for a few hours, but we're really good at dealing with this.
Video: No Tsunamis. Clear water
Announcer: 6 Meter Tsunami Warning
American News: 10 METER TSUNAMIS!!!! BWAAAA!!!!
It took the US news (nytimes.com) at least 20 minutes to have anything up, but twitter and facebook exploded instantly.
I want mass media to diligently collect all the information they can get and I know that that takes longer than just sending a tweet. Whether the New York Times writes about the event five minutes or an hour after it happens doesn’t matter in the grand scheme of things.
This used to be a huge problem for me, sine I would be constantly out-of-touch. But nowadays, I find that Twitter/Facebook tend to keep me up to date on anything that's really big.