Computer-related

• DevHumor.com
  Various computer related images and jokes
• xkcd.com
  Funny online comic strip about all things nerdy

Miscellanous

• Pottermore
  Learn what house you are in Hogwarts
• cheezburger.com
  LOL cats and all things meme.

• Stella (Atari 2600)
  The Atari 2600, released in the late 70's, was the computer that started the console revolution. It was the reigning champion until the Nintendo NES.
• Nestopia (Nintendo Entertainment System)
  The most common console people think of today, the NES brought Super Mario Brothers to U.S. culture
• DOSBox (DOS)
  DOS was the main operating system before Windows 95. A large library of software was written for it - and a large amount is still being used today. This emulator can be used for both entertainment and serious business.
• VICE (Commodore 64)
  The Commodore 64 was one of the most emblematic computers of the 1980s. As a testament to its incredible graphics and sound (for its time), it was manufactured for over 11 years unaltered.