I believe this man's name is Lance Orton, he's the street vendor in New York City, and a Vietnam veteran. He alerted the police to the bomb in Times Square. His message to New Yorkers is "If you see something, say something." Great advice. This could have turned out really badly.
Hot Air has more on the story. There was speculation that the offices of Viacom were the target because of South Park's depiction of Mohammad. But now it looks like the Taliban is taking credit. The police say that the propane bomb was only moments from going off. That would have been a nightmare.
Update: There's a report that this was a diversion, and a larger attack is scheduled for a later date and time. I hope they're wrong.