Pre-Snow Leopard, a PPC emulation layer called Rosetta was a standard part of the install on intel Macs, as of Snow Leopard it's an optional install, it allows you to run most PPC binaries, but since the switch to intel is a long time ago apple has started to ween us away from using PPC software.
Hi Lando!
This is infact my mistake - the Mac executables on our homepage was compiled using a beta-version of Hollywood 4.5 that only produced intel-executables. I forgot to edit the specs on our homepage 
The final version of Hollywood 4.5 does support both intel and ppc-macs. When you compile the software you may choose what operatingsystem you want to support (so you may infact make executables for all supported operatingsystems in one go (amigaOS, morphOS, Win, MacOS etc.).
I don't own a Mac myself and don't know much about it.. is it possible for intel-macs to emulate/run ppc-mac executables ?
best regards
Torgeir Vee