(2016 Update: Links are dead)
I received some requests to update the Play Sound Automator action to work with newer Macs, so I went and posted the source to Github. Upon restoring the source code from a backup, it was quite a surprise finding out that it was already a git repo… five years ago!
I also rebuilt a binary version of the action, which is incredibly simple to install: just double-click. It is also compatible with both PPC and Intel Macs, I had success running it with 10.4 on a G4 Mac Mini. You can download from Github.
Additionally, it is now open source so if you see any changes, fork it on Github and let me know!