Looks like ObjectSpaces is not yet ready for prime time. They will be shipping as an add-on to Visual Studio 2005.
I would love to know what they've been hitting their heads against. Perhaps they've learned that there are no large scale successful ORM products becuase it's a really hard problem. Delay can only mean better design, in my book. Still, I'm champing at the bit to see what they'll come up with.