This new project:- http://blog.openmediavault.org/
is looking extremely good. There are a lot of snap shots of the management pages so far.
Volker, the person responsible for this new project was also the creator of FREENAS, however OMV is Linux based.
Although there is no mention of Sheevaplug, he says that if you can install Debian , you can install OMV !
He has finished a lot of the bits, but so far he is holding off from a release until he is comfortable with it.
I cannot find any reference to it already on this forum, so here you are!