So this is interesting, by default ( at least with AdaFruit's occidentalis 0.2, http://learn.adafruit.com/adafruit-raspberry-pi-educational-linux-distro/occidentalis-v0-dot-2 ) I was only seeing the first 256m of the ram.
Looking at the documentation http://elinux.org/RPi_config.txt it looks like a simple modification to /boot/config.txt addressed the issue:
gpu_mem_512=8
pi@raspberrypi ~ $ free -m
total used free shared buffers cached
Mem: 486 56 429 0 9 28
-/+ buffers/cache: 18 467
Swap: 99 0 99
It looks like the kernel actually took 16 meg instead of 8 like I wanted but I'll take it :-> I'm logging in only via ssh so I don't see a reason to waste memory on video output.
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