vcd/divx player

any DVD playing software on the mac should also play VCD's. DiVx/xViD/3ivx is a diff. story...

divx is now available on the mac...

http://www.divx.com/divx/mac/

3ivx is available for the mac...

http://www.3ivx.com/download/macos.html

xvid I have no idea. you can get the PPC source code from www.xvid.org but you'll need to know how to compile it, etc.

I don't have a mac but from what I understand you'd just need to install these codecs and quicktime 6.x should be able playback your content.