Raspberry Pi
The Raspberry Pi is a basic computer system that fits on a single circuit board about the size of a credit card. It was developed in Britain as a means of promoting the teaching of computer science and engineering in schools. However it has also been in demand by hobbyists as a simple video game system, and as a powerful robotics controller.
It isn't exactly powerful, but it does run Linux on a 700MHz processor (compared to 2000MHz on the most basic desktops) and 512MB of RAM (compared to a few thousand on a PC). Instead of a hard drive or DVD drive, the Raspberry Pi runs off of a flash memory card, although some hobbyists are modding it to use cloud storage instead.
Perhaps the most admirable quality though is that it is being sold at around $25 - $35 depending on exactly which features are required. (The more expensive model includes ethernet networking and a spare USB port)
So although it may not seem like much to some people, to many educators and hobbyists a $30 computer is truly an amazing accomplishment, and certainly worth commenting on its first anniversary!