Robots!

http://www.boston.com/bigpicture/2009/03/robots.html

And N^o.25 especially:
http://blogs.spectrum.ieee.org/automaton/2008/07/02/a_look_under_the_hood_of_kiva_systems_warehouse_robots.html

Swarming warehouse robots for efficient inventory filling. Yep, the future's getting here.