if i'm not mistaken, the ordnance that took out zarqawi was one of the new cement bombs that had been tested because of its contained effect making it safer to use in densely populated areas.
They've been using them for a long time. Many targets in Baghdad were hit using them at the start of the war. They are excellent for minimizing collateral damage. The Brits were dropping pure concrete guided bombs on positions as well. They didn't contain any explosives at all, but you'd never know it. The kinetic energy and explosion is amazing from a 2000lb hunk of cement dropped from a 5 miles up.
Cement filled bombs of the Mk series are just dimensionally correct 'blue' brothers of their green brethren. Their blue color means they are inert with no HE filler. They fly just like the rest of them. Zarqawi ate a pair of regular green 82s. There is no other way to account for the destruction on site without HE. The blues have been used to destroy vehicles close to buildings, with the kinetic effect.