The download on
http://www.inivis.com/secondlife.html has been updated and includes a fixed version of the Mac Secondlife Sculptie exporter (secondlife_export.p).
This is now compatible with PowerPC/non-Intel Macs. It fixes a problem where Second Life sometime crashed when uploading an AC3D exported .tga file.
You will only need to download this if you have an older PPC/non-intel Mac.