Technology Focus Area for IBM Technology Contest is  Enterprise Computing.      

• As the technology focus area for the contest is Enterprise Computing based on System z technology, the following links may help you to get insight in this technology.

• Destination z

• Mainframe Academic Initiative

• z-OS Basics an online eBook

• z-OS Basic Information Center

• Online Community: Blog

• Online Community: Facebook

• Concepts of Large-Scale Commercial Computing

Of course you can get great information on history and usage of System z using any search engine.