Muta micro vs. Thors and hunter seeker missiles

IdrA showed this technique at the 2010 IEM grand finals in Cologne, Germany, against Tarson's thors, and handily took the win. There's nothing new about the technique IdrA used. In fact, the technique has been known since early beta. However, it is certainly underutilized by even the best zerg players.

The method is this:
Select your mutalisks, and have them move to a location so that they are all together, but allow them to spread out evenly as they naturally do.

When you are ready to engage enemy thors, click to move your mutalisks over the Thors. Do not click to attack the thors, and do not A-move. Once the Mutalisks are directly over the thors, press s or h or a-move so that the mutalisks begin to attack. Now the mutalisks will attack but stay spread out, so that the thor aoe does very little damage to the mutalisks.

Remember that thors are still and effective counter against mutalisks when they are in good numbers and have marine or viking support. This micro technique alone will not win you the battle, but can do a lot to help.

Here's a demonstration of the technique, courtesy of Psystarcraft:

This method can obviously also be used to engage any terran who you know to be using hunter seeker missiles, just the same.