Col. Sam Gardiner gave Wolf Blitzer his view on the nearness of a military attack on Iran. See Think Progress.
A key item of data is that U.S. naval vessles have been directed to move towards Iran.
The most extreme view I have read is by tristero at Hullabaloo. Since Bush has ruled as an extremist with trust in the military and nothing else, there is no reason to assume that he will be reasonable with Iran. My best bet is that after the November election, Bush and Cheney will see no downside to attacking Iran. They will not be running for election again, and the make-up of the Congress will then be established until 2008.