Well the least ideal I saw was from JVC. They had a 1080p screen with a circular polarizing filter, which gave each eye 960x1080 resolution.

The problem was the demo was using the interlaced method of storing 3D content, which uses 1920x540 resolution. So they take the 1920x540 image, convert it to 960x1080, and the end result is less than tack sharp - 960x540 basically.

I believe the new 3DBD standard is supposed to deliver full 1920x1080 for each eye, which is of course what you'd want for either front projection for LCD shutter direct view.

I wonder who will be the first to release an inexpensive 2-in-1 3D polarized projector?