Re: Clash of the Titian's
Here's the problem with dimensionalization - when doing CG elements (creatures, environments, etc) you more or less get the 3D for free because the geometry used to create the imagery still exists in mathematical 3d space. However, taking film that was shot in 2D and trying to make it match in 3D space requires a lot of voodoo.
Essentially you have 24 frames per second, but a slightly different image for each eye. Objects that are closer to the camera display more parallax between frames and what compositors have to do in post-production is create "the missing eye." The way we did it on "Alice in Wonderland" was VERY tedious but thankfully almost all of the environments were CG to begin with. There was an army of artists that animated proxy geometry to match Alice, for example - the way her dress moved, hair, arms, etc. This was placed into the 3D environment so that it was in the proper spatial location compared to everything else. Then the original 2D filmed plate was projected onto the proxy geometry. This had to be done for all of the actors and what little set they shot.
"Clash of the Titans" didn't have such luck, so the entire scene had to be recreated and match moved. It was all done in 2 months by an Indian company (as well as artists here in Hollywood). The results were pretty ugly.
A safe bet for a good 3D experience is going to be all CG animated features like "How to Train Your Dragon". Like I said before, you get the 3D aspect more or less for free (but there's still a LOT of work to do). Another one is a movie like "Avatar" that's been shot with stereo cameras, however Hollywood doesn't like the price tag for such things so expect this post-3D to be more the norm.
Right now the studio is fighting with Michael Bay to make "Transformers 3" in 3D.