Why Bush hasn't started bombing Iran yet

Apparently it's because, when he offered military action to Britain to "help" in the release of the 15 British sailors, the British told him to back off:

In the first few days after the captives were seized and British diplomats were getting no news from Tehran on their whereabouts, Pentagon officials asked their British counterparts: what do you want us to do? They offered a series of military options, a list which remains top secret given the mounting risk of war between the US and Iran. But one of the options was for US combat aircraft to mount aggressive patrols over Iranian Revolutionary Guard bases in Iran, to underline the seriousness of the situation.

The British declined the offer and said the US could calm the situation by staying out of it. London also asked the US to tone down military exercises that were already under way in the Gulf. Three days before the capture of the 15 Britons , a second carrier group arrived having been ordered there by president George Bush in January. The aim was to add to pressure on Iran over its nuclear programme and alleged operations inside Iraq against coalition forces.
At the request of the British, the two US carrier groups, totalling 40 ships plus aircraft, modified their exercises to make them less confrontational.

The British government also asked the US administration from Mr Bush down to be cautious in its use of rhetoric, which was relatively restrained throughout.

The incident was a reminder of how inflammatory the situation in the Gulf is. According to some US and British officers, there is already a proxy war under way between their forces and elements of the Iranian Revolutionary Guard.

This week has been a strong repudiation of the Big Swinging Dicks foreign policy to which the Bush Administration adheres. First you had the release of the British soldiers without a drop of blood being spilled, then you had Nancy Pelosi showing the power of diplomacy in her dealings with Syria.

I would hope that Congressional Republicans and the military would look at these events and perhaps for once try to put the brakes on this bunch of lunatics that would blow up the world rather than admit that their dicks aren't as big as they think they are.

(h/t: Cernig)