It's out since December 2008 and I managed to test it recently.
It's a very interesting and nice tool.
Just have the VM mounted so not tryed to look inside or hack it, but it look promising.
It's both a working and gaming opportunity.
For a DM that have to host an online game and have a fairly powerfull PC that can host a VM just install the DimDim machine and add MapTool and you should be up and running on your own.