Is Zarqawi dead?
Roger L. Simon remarks,

If Zarqawi has been killed... and the AP is correct that there was a tip on his whereabouts... that tip could have come from inside Al Qaeda itself or from people friendly to it. After the Amman hotel horrors, Zarqawi was the blodthirsty poster boy for the Al Qaeda Psychopath. If you believe the Zawahiri letter, they didn't need publicity like this. He had to go.

Dreams Into Lightning has round-up and links. Apparently it's highly unlikely that Zarqawi's dead.

Update: Extended tribal ties among groups in al-Anbar Province in Iraq may be what has kept him safe thus far. Now anyone who wants to betray him for the reward money does not have to worry about having Zarqawi's kinfolk coming after him in a blood feud.