Have you read this article? I just read it: it sounds like the Israeli's are very serious. (They have denied this, but then they would of course, if they still officially deny that they have nukes?) And the Sunday Times is not some nut blogging on his own, just making things up.

Robert Gates, the new US defence secretary, has described military action against Iran as a "last resort", leading Israeli officials to conclude that it will be left to them to strike...

Sources close to the Pentagon said the United States was highly unlikely to give approval for tactical nuclear weapons to be used. One source said Israel would have to seek approval "after the event", as it did when it crippled Iraq's nuclear reactor at Osirak with airstrikes in 1981.

The Israelis have made it very plain that they will not tolerate Iran's becoming a nuclear power, and once Bush leaves office, they will never get a chance like this again. I can't believe all this is just to intimidate Iran. Iran is riding pretty high right now, and has made it clear that it will not allow itself to be intimidated. And look where cooperating with weapons inspectors got Saddam...

A bomb, H bomb, Minuteman / The names get more attractive / The decisions are made by NATO / The press call it British opinion -- The Three Johns