Now that Adobe has shipped Photoshop and After Effects CS5, it's time for ProEXR to join the party. Available now is version 1.5, complete with 64-bit versions for Mac and Windows. In fact, the Photoshop plug-in has been rewritten from the ground up to take full advantage of all the memory you can throw at it and load those giant EXRs as fast as I know how. As usual, this update is free.
After Effects CS5 ships with 1.5 pre-installed (shout out to my Adobe pals!) and CS3/4 users can update their plug-ins with 32-bit versions, also included.
But wait, there's more. Also included is ProEXR EZ for those Photoshop users who wanted extra alpha control but less multi-layer confusion. Not to mention countless small improvements and optimizations.