http://www.youtube.com/watch?v=zCZY9Z6WvSY
Look at the gun that Gene Simmon's character fires 1:29.
The bullets were programmed to home into a person's heat signature.
The ubiquitous networks and surveillance depicted in the movie are fully realized.
Now the bullet will be also.
It has a ton of stamps/brushes and should be easy for any 4 year old to work. You can customize what options are available, and lock it down as much as you want.
When assembly is complete with STS-134 and the addition of the AMS experiment, the validity of the question will be equivalent to asking if the Alaska purchase was worth it.