Attached Link: http://www.debevec.org/HDRShop/

Yes and no. Currently, the only mapping mode supported in HDRI is latitued/longitude some times referred to as mirrior ball. This is the same layout that Bryce uses in it's Global Camera mode. Bryce just doesn't do HDRI stuff though... I don't know if their will be more formats supported in the final release of C3. Also, there is and free HDRI manipulation tool that will allow you to change other probe formats into the one supported in Carrara3 called HDR Shop. It can be found at the above link plus other great info. Also, the maps at that link ARE in the format that C3 uses. HDR Shop is only for PC though. As far as I know, there is no tool available for the Mac platform that will allow you to manipulate the images the HDR Shop does. Mark