This topic was started last year, but I found it when searching for 3d projection rental. There aren't a lot of companies out there that do this, and I don't think there are ANY that do it nationwide except for one. In full disclosure I work for the company, but I've also done a lot of research before we bought any equipment to find out if there was anyone else out there doing stuff like this. No one else was, so we jumped in the ring.
Here's our page about 3D: http://www.meetingtomorrow.com/category/3d-projection
Here's some information that will be important to know before you call us or anyone else:
There are two types of 3D projection: active or passive. Active is usually just one "3D capable" projector but it requires everyone to have expensive glasses that shutter and have a battery. They also require line of site and you have to be close enough to the screen that the IR that's being projected can be seen.
The other method is passive 3D projection. It requires two projectors with polarizing filters and a specialized polarization preserving screen. We own two 20ft truss screens so we can make an image large enough for groups of hundreds of people. This also allows you to use regular passive 3D glasses (like in the theaters) so that makes them much more comfortable for users.
I hope this helps anyone else who is looking for this in the future. Feel free to give us a call if you want more information!
[Edited by johnbegone on Feb 8, 2012 at 12:43 PM]