The new Model A Pi has been released exclusively to Europe with a single USB port, 256MB of RAM, no Ethernet and one-third the power consumption of a Model B board.
For approx. £19, the Model A is designed for use in battery or solar-powered devices like remote sensors, WiFi repeaters, robots and so on. According to an Adafruit it consumes only 100 mAh of juice (compared to about 300 mAh for the Model B, due to Ethernet power requirements).
I can’t wait to see what the hardware hacking community come up with for this new flavour of Pi!