Hi,
I just came across Turnkey and looks very interesting for what I wish to do.
That is to create a light weight NAS for my new HP Microserver (N40L)
I have tried FreeNAS and OpenMediaVault.
FreeNAS is BSD based -- I prefer Linux as I am a NB and got a better chance to learn *ix with Linux than BSD. Boots from USB Flash Drive but runs in RAM.
OpenMediaVault (OMV) is like FreeNAS but based on Debian.
It is very good. Had it up and running in 10 minutes.
The issue with is that when installed on a USB Flash drive, it is writing to the flash drive all the time.