[Beowulf] why we need cheap, open learning clusters

[Mark Hahn]

> The "Minnow Board" http://www.minnowboard.org/ might be of interest, though

cute.  though if I had to put together a demo cluster where performance 
was not the goal, I might consider using cheap wifi routers.  just ignore
the wifi: think of them as very cheap, low-power MIPS "servers" 
with built-in support for interesting network topologies (FNN, etc).

after all, if you're trying to build character, you might as well also 
deal with having as little as 32M ram and processors slow enough to notice ;)

probably also one of the few clusters that could run from a quite modest battery.