I am gobsmacked!
These are great, I suddenly started noticing ants after seeing these and have become addicted to watching them.
Yesterday I noticed a green-ant proudly carting off a giant (relatively) cat-biscuit.
I didn't have a macro lens, and the 2" nosepiece was sitting on the front of my nikon, so I grabbed a 50mm lens and hand-held it on the end of the nose piece, and held the camera with the other hand and tried to get a shot.
Needless to say it didn't go quite as well as yours :O , but it was fun getting down there and watching them, they sure do motor along.
How are you getting that much DOF?
I tried to video him as well.
http://youtu.be/XRDpocpzcY4