So I've been trying to get OMV to install under Wheezy (on ARM hardware, but arch doesn't seem to have caused any problems so far. because OMV on raspberryPi would be awesome!)
Some notes:
The php5-auth-pam/php5-pam dependency problem has progressed in Omnius (nice naming scheme, btw) but is not yet resolved. php5-pam won't install as it depends on phpapi-[somenumbers] which should be/is provided by php5-cgi, but apt doesn't seem very happy about this. dpkg --force-all -i php5-pam.deb does work, and then omv stops balking at a lack of php5-pam.
scponly is not available in wheezy, but is a dependency of omv. grabbing a deb from squeeze works fine.
Once I've manually installed all the dependencies of the openmediavault package, the problem I then run into is (I think) postinst related - every config file omv writes into, it writes html-ised. So where a config should have a "<" it instead gets a "<". collectd and apache were the most notable cases so far.
My attempts are ongoing, I just thought I'd put a thread up.