I was able to install omv ver .3 then bump it to ver .4 on my goflex home. It looks like Volker Theile or someone on the team must be working on the arm version.
there is a tutorial on how to do it for a pogoplug classic at:
http://forums.openmediavault.org/viewtopic.php?f=12&t=514
I know for sure that it works on the goflex home (very nicely 
) but I would think it should work on any of the ARM ver 5 Platforms machines such as goflex net, dockstar, Sheeva Plug, TonidoPlug and others that have a ver 5 kirkwood processor.