How do you use Drones?

[Power Man]

I have used them a few times as colony killers.
If I am sharing a system with another player I will build some planet attack drones on all my planets. Then when War happens, and it usually does, I launch all the drones and attack his planets.
This works best against those AI's that tend to have lots of little colonies. They usually have no defences and can be cleaned out in a hurry.
I get rid of the enemy in the rear without having to send in a fleet.