I think the new glasses for the iz3d needs a mention.
Some info by Yuriy
Here
I'm also a betatester of the glasses and my experiences matches yuriys.
@gicko: I think you should try these when they are ready. We (betatesters) had two tests with new glasses and i can assure the experience is way better with those. Still not perfect but way acceptable. I don't know a releasedate for the new glasses but check out the iz3d-forums and site for news. It feels like the release should be quite close for now.
The zalman isn't perfect in any way either. Some find the interlacing of the zalman disturbing while others don't. There's one specific "sweet spot" in front of the monitor where you have a proper experience while viewing from the sides or from lower or upper spots gives and unproper vision. The ghostingrejection seems to be good with the zalman. The zalman can be run with both newer nvidiadrivers and the iz3d drivers. It probably also works with nvidia old-school (winxp, up to 7900 nvidiacard) drivers which gives you alot of oppurtunities to play your older games too.
The nvidia 3d-vision obviously tampers with some amount of ghosting (at least with the Samsung 2233RZ that's included in the bundle) according to user threads on the nvidiaforums. The ghosting seems somewhat equivalent to an old setup with crt/shutters. 3d-vision works only with newer drivers from nvidia and because of the needed usb-dongle it might stay that way. It's most probable that ghosting is decreased with a better monitor/projector. 3d-vision can only be used with winvista and above and an nvidiacard 8000 series and above. Newer 260-280-295 series is "above".
The iz3d suffers a bit from "transparent" ghosting. It's not always hard contrast situations that makes the ghosting visible. More brighter areas in all like the sky etc. New glasses decreases the ghosting to a fully acceptable level if you ask me. It's not totally gone in any way but the experience is more than decent compared with the other solutions. The iz3d works with iz3d-drivers and "old-school" nvidiadrivers. You need a dual output videocard. For the iz3d-drivers it doesn't matter if it's ati or nvidia. No support for opengl (doom3, quake4 and prey) games yet. Most games uses directx though.
Another but expensive option should be going for a "passive projector rig". It has no visible ghosting and a high light output. If you choose your equipmnet carefully from start you're going to get the most probably best experience a 3d-rig can give. It's expensive though (2 projectors, "silverscreen" and polarizsed filters, some very expensive).
It has a very high softwarecompability (nvidia old-school, ddd as well as iz3d-drivers, peter wimmers player etc etc). You need a videocard with dual outputs for this though. The only thing not supporting this rig is newer nvidiadrivers...
You need one pair of cheap polarized glasses for each viewer.
Another option with two projectors would be using infititec filters (colorfiltering but in no way comparable with anaglyph) and projectors. This works similar to a passive polarized projector rig but with no need for the special silverscreen. I have no personal experience of this rig (ghosting rejection, brigtness etc). Same software requirements as above mentioned polarized projector rig.
I'm not excpecting any future support from nvidia for these passive setups though.
I have a dual passive projectors setup as well as an iz3d. I gamed quite some time with e-dimensional glasses before. What i wrote about the zalman and 3d-vision is what i caught by reading the forums. I don't have any personal experience of those though.
Or generating the stereo pair from the Z-buffer