If I correctly understand what is said in the weekly modcast on Luxology forum, there's currently a "3DM translator" under development. This plugin (99$ ?) will permit to Import and Export tesselated data from 3DM files into Modo.

For those interested, here's the link to the thread (please correct me if i misunderstood something) :

http://forums.luxology.com/discussion/topic.aspx?id=18878

And here the direct link to the modcast (QuickTime required)

http://content.luxology.com/modo/301/modcasts/Aug10-2007.m4a (the info is almost at the middle of the modcast)

They mention Rhino, but I imagine that it will work with MoI files as well... Maybe the end of the "problems" for importing MoI data into Modo ??? ;-)