Nick Carr notes that for web 2.0 - as with web 1.0 - it's all about infrastructure:

In its latest quarterly financial report , Caterpillar revealed that, in North America, "sales for electric power applications increased 41 percent [from year-earlier levels] supported by data center installations." (One of Caterpillar's major competitors, Cummins, also reports record revenues in its generator business, with worldwide sales jumping 33 percent over the course of the past year.) Demand for the generators is so strong, in fact, that shortages of the machines appear to be significantly delaying the construction of new data centers. A year ago, Data Center Knowledge reported that the lead time for the delivery of a two-megawatt generator, a mainstay of today's data centers, was a full year. I hear that supplies remain short today, delaying construction projects nine months or more. Rumor has it, in fact, that Microsoft and Google have locked up a significant portion of Caterpillar's production for the foreseeable future.

I have to say, I would not have guessed at Caterpillar as being one of the winners in this. It makes sense, but it was not obvious to me.