I wouldn't limit this to MetaStream (which I don't think you intended) because MetaStream is Viewpoint now, and more importantly I think, the ultimate Winner of this game could still be someone else, like 3D Flash from Macromedia. If TGS's ZAP Player was developed more (or purchased/better funded) it could be a real player too... As some of the people on the Adobe Forum pointed out, Adobe isn't great at developing promising new software, despite being a big company- they can be pretty stupid. I am also surprised that they or Microsoft didn't buy 3D Explorer. Those guys had some truely amazing 3D technology that is highly useful. Maybe Right Hemisphere will come up with something. A lot of very innovative new 3D software is coming out of Australia and New Zealand these days... Also, like them or not, don't forget Microsoft. When Bill Gates smells a big new market brewing, you can be sure he will be there...