What?? Do they still use the red/green ones somewhere?
Imax uses glasses that combine both color lenses and polarized lenses. And they aren't perfect, so you get a lot of bleed over (especially noticable during credits), and if you tilt your head you get a lot more bleed over.
RealD uses polarized only lenses, but instead of linear polarization they use circular polarization, which isn't affected when you tilt your head.
RealD is superior for this, but of course it's patented, and IMAX is already invested in their version. I took the disposable reald glasses and put them in clip on sunglasses so I don't have to wear the headache inducing frames they provide (one size fits no one!).
We saw it in imax tonight (it was awesome!) and I want to see it in reald later to see if there's really as big a difference as I think there is.
Either way, this movie is a major win. I really enjoyed it. It was a simple story, and one might be understandably upset that it's a relatively overdone/trite/etc plot, but I thought it was assembled well, told a "real" story (in the sense that verbal tales, such as brothers grimm, are "human" tales easy to remember because they strike a chord in us) and was presented in a rather spectacular way.
Definitely one to be seen again.
I'm more excited about the announcement of 3D blu-ray, and existing 3D TVs, etc - I suspect Avatar will be one of the 'showcase' films for that consumer push this fall (still expensive, and early adopters only, but they'll be out and available).
But yeah, definitely going to see it again.