Caligari has been in the 3D modeling space for a long time and have a variety of products including those for aiding game development.
What is interesting is that:
a) They are joining the Virtual Earth Team
b) The Virtual Earth Team is looking to 'build an immersive 3D Web experience' according to Caligari's CEO.
The overlap and joining into the Virtual Earth groups seems a tad odd but given Caligari's background in modeling, games and 3D social networks, could be interesting and is definitely something to watch.