Iran attack: how soon?

I think it's overwhelmingly likely that the US and/or Israel will attack Iran, and perhaps very soon. I've posted previously on signs of an Iran attack. To James Dunnigan's "Ten Signs the US Is About to Attack Iran", I'm tempted to add:
11. Top general says US is not about to attack Iran.

There's been a spike in sectarian attacks in Iraq, too, as Debka notes:
Officials in Baghdad report 120 Iraqis killed in last 48 hours – 1,450 since Feb. 22 blast at the Shiite mosque in Samarra
March 27, 2006, 10:33 PM (GMT+02:00)
The ministry of human rights appealed Monday to US forces and Iraqi security groups to protect civilians during their raids.

Despite all the diplomatic gymnastics, it looks as if Washington and now London are preparing the public for a military showdown. ElBaradei is talking, but I don't think the guys in Tehran are listening.

Related posts:
US to outspend enemy in Iraq?
"Israel will have to attack Iran."
Morning Report March 19 2006
Morning Report March 26 2006