The R? has gotten a mixed reception 'round here, but here is something
interesting: a tutorial of programming the thing (which makes this
sort-of kinda on-topic) in bare-metal Assembly; including talking to
the graphics chip as a plain bitmapped framebuffer and input from the
USB port (the latter using a library, I think).
I haven't received mine yet, but I really want to try that out...
http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/os/
--
Joachim Thiemann ::
http://jthiem.bitbucket.org ::
http://signalsprocessed.blogspot.com