I think you're on to something...

http://en.wikipedia.org/wiki/Multiple_independently_targetab...

Alternatively, SLAM, the (never made) supersonic nuclear powered cruise missle that would fly across a country popping off nukes as it went: http://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missile

That was one scary piece of hardware. Fly a group in formation and completely depopulate large sections of planet.

Even better, how about laser-riding submunitions on our missiles? Sounds cooler, anyway.

http://en.wikipedia.org/wiki/Starstreak_missile

It's missles all the way down...