The Raspberry Pi has made quite a splash in the educational and enthusiast markets. For $35, educators, hackers, modders, and others could get a fully functional computer system, albeit ARM-based, that was capable of running Linux. Ironically, that version is the Model B and has been shipping for seven months.
The Model A, a stripped down version of the Model B, is just now beginning to be produced, with the first engineering samples beginning to roll of off the production line. This new board is set to cost users only $25 and will come with fewer accouterments than its more expensive brother.
The Model A will lack an Ethernet port and only come with 256MB of RAM and a single USB port. According to a blog post by the Raspberry Pi Foudnation, they are already receiving orders from "people making industrial control modules, from roboticists, from people doing automation." The Model A is likely to ship in 2013.