Last time - after Shalit was kidnapped and Israel turned to Gaza - it took Hezbollah less than two weeks to start a war. And if UNIFIL reports are true then they were within hours of starting another one just a few days ago:

The Lebanese army on Thursday discovered and defused eight Katyusha rockets that had been placed near the southern town of Nakoura and were about to be fired at Israel. The 107-millimeter projectiles were fitted with timers and were defused "a short while before the time set for their launching," according to the Lebanese news site Naharnet. Voice of Lebanon radio specified that the rockets were set to be launched between 10 and 10:30 p.m.

Hezbollah is bristling with missiles - Jimmy Carter's touching concerns otherwise notwithstanding - and over the last few weeks Nasrallah has been making a huge show of supporting Hamas. It's gotten to where it might be an embarrassment for him if Israel systematically dismantles their infrastructure. And even if Hezbollah's rank and file would rather sit this one out it's not clear that they'll be allowed to. Iran has significant operational control over both Hamas and Hezbollah so it's not too much to assume that there's some coordination going on. But the IDF has made it very clear that - now that Hezbollah is in formal control of Lebanon - they won't be as restrained as they were during Lebanon II. How much that matters or not to Nasrallah and how seriously he takes the threat - not much and unknown - will determine a lot of Hezbollah's behavior.

At Hot Air Ed is wondering if Hamas isn't actually banking on a full-scale regional war:

Hamas made it clear last week that they wanted war. They announced the end of the so-called truce, although as the 16th paragraph in this report finally makes clear, Hamas and other affiliated groups had never stopped attacking Israel. They want to provoke a wider war and hope to get Egypt involved. The Egyptians opened the border to provide emergency medical care to the wounded and condemned the attack, but have not broken diplomatic relations with Israel yet over the attack.

Hamas has certainly been calling for Arab countries to retaliate but I doubt they seriously think the Egyptians will come to their rescue. It's true that Egypt half-heartedly tried to warn Livni off an invasion - eliciting my favorite diplomatic moment in a long time - but they've been at odds with Hamas for a while. Last April Hamas got caught conspiring with the Egyptian Muslim Brotherhood to blow up the Gaza-Egypt border - not a way into the Egyptian regime's affections in the first place and certainly not when done in the context of trying to establish an Islamist state on Egypt's border. Besides, Egypt knows where to place the blame for instability in the Palestinian territories and beyond: