It's Cringley so you have to take it with a grain of salt.

http://www.pbs.org/cringely/pulpit/pulpit20051117.html

Most interested in the teu container thing (twenty foot equivalent unit) not in a taking over the internet. I've seen these in various places in Africa. Datacenters in trailers have been around since the early 70's, but tractor trailers are pretty large, and fairly delicate compared to containers, and now that basically everyone on the planet has container handling equipment, you can drop containers pretty much anywhere you want, ship them on airplanes etc.

See:

http://www.apcc.com/products/family/index.cfm?id=318

for an example of datacenter in a tractor trailer.