Read something today that reminded me of this, the first paragraph from William Gibson’s novel Count Zero:

They set a slamhound on Turner’s trail in New Delhi, slotted it to his pheromones and the color of his hair. It caught up with him on a street called Chandni Chauk and came scrambling for his rented BMW through a forest of bare brown legs and pedicab tires. Its core was a kilogram of recrystallized hexogene and flaked TNT.

Having read that, now take a look at this link (courtesy of Engadget) on what the mad scientists at Darpa are trying to create.

[Note: Links went dead, so here’s a Wikipedia entry – BigDog]