Son of Thor
Rather a while ago, Jerry Pournelle helped develop a weapons concept called Thor. Basically Thor was a collection of meter-long tungsten rods in low-Earth orbit, each rod having it's own de-orbit package and guidance vanes. Whenever a powerful (but non-nuclear) strike would be needed, commands would be send to the appropriate number of Thor rods, which would de-orbit, then guide itself to the target.
By the time these puppies hit the ground, they've got several thousand feet/second kinetic energy each. You better believe anything hit by one (or more) of these is going to be wiped out, like a bolt from above. Or, like Thor's hammer.
While the DoD hasn't gone that far yet, it has developed what StrategyPage.com calls "A Deadly Bomb With No Explosives." (scroll down to the May 4, 2004 entry)
The CBU-107 Passive Attack Weapon (PAW) is basicallly a cluster bomb carrying several thousand steel and tungsten "bullets," instead of the usual bomblets. This results in a non-explosive, kinetic-kill weapon with very good accuracy, where the "bullets" reach speeds of up to 1,000 feet/second. The target is destroyed without secondary explosions, or any "leftover" unexploded munitions on the ground.
Wow. But, I still want to see the orbital version...