Good Gear Guide
In pictures: The (mostly) cool history of the IBM ...
In one of the most strategic moves IBM ever made with the mainframe, in 2000 IBM said it would begin supporting Linux on the mainframe, a huge nod to that systems growing influence. By 2009 70% of IBM's top 100 mainframe customers were running Linux, according to Gartner.
In pictures: The (mostly) cool history of the IBM mainframe