A credit-card sized, bare bones, single-board Linux computer for $35, developed by the Raspberry PI Foundation..
You need to get the other components - enclosure, power source, keyboard, mouse, screen, cables, OS, etc - separately... Here's an enclosure:
The tech specs:
- Processor: Broadcom BCM2835 700MHz ARM1176JZFS with FPU and Videocore 4 GPU
- GPU provides Open GL ES 2.0, hardware-accelerated OpenVG, and 1080p30 H.264 high-profile decode, GPU is capable of 1Gpixel/s, 1.5Gtexel/s or 24GFLOPs with texture filtering and DMA infrastructure
- 512MB RAM (Model B)
- Additional specs: 10/100 BaseT Ethernet, HDMI, (2) USB 2.0, RCA video, SD card socket.
- Powered via a microUSB socket.
- 3.5 mm audio out jack.
- Boots from SD card.
- Size: 85.6 x 56 x 21 mm
Raspberry Pi resources:
RPI Community links
RPI on Wikipedia
Raspberry PI articles on lifehacker
Raspberry PI User Guide (Amazon)
10 coolest uses for the Raspberry PI
Top 10 Raspberry Pi Myths and Truths
The MagPi (An online magazine for RPi users)
RPi Reviews on YouTube
RPI Tutorials on YouTube
RPi forums (Stellarisiti)
RPi forums (Plex)
archlinux RPi forums
RPI community forums
BodhiLinux RPi forums
Openelec RPi forums
xdadevelopers RPI forums
Raspberry PI hacking (xdadevelopers)
"Official" Raspberry PI forums
Unofficial Raspberry PI forums