The Raspberry Pi was created with a simple mission in mind: change the way people interact with computers. This inexpensive, credit card-sized machine is encouraging people, especially kids, to start playing with computers, not on them.
When the first computers came out, basic programming skills were necessary. This was the age of the Amigas, BBC Micros, the Spectrum ZX, and Commodore 64s. The generation that grew up with these machines gained a fundamental understanding how how computers work.
Computers today are easy to use and require zero understanding of programming to operate. They’re also expensive, and wrapped in sleek cases. While aesthetically pleasing designs and user friendly interfaces make computers appealing and accessible to everyone, these advances create a barrier to understanding how computers work and what they are capable of doing. This isn’t necessarily a problem, but for those who really understand computers, it seems that our collective sense of the power of computing has been dulled.
Raspberry Pi marks the beginning of a conscious effort to return to computing fundamentals. Starting at about $25—case not included—it’s purposely designed to remove barriers to tinkering, reprograming, and, ultimately, to understanding how computers work. This return to fundamentals is rejuvenating the curiosity and creative spirit of computer hobbyists around the world.
The vibrant community of Raspberry Pi enthusiasts have found good use for an ARM processor, a GPU, a few ports, and an operating system (typically Linux-based) loaded onto an SD card. A quick Google search will return ideas for building your own Pi powered robots and helicopters, humidity and temperature sensors, voice activated coffee machines, and sophisticated home security systems—homemade cases encouraged.

Link ~> http://blog.cloudflare.com/dyi-web-server-raspberry-pi-cloudflare