Comment Source Code Available Here (Score 5, Informative) 151
It appears that a guy named Ruben Unteregger published the source code on his site at http://www.megapanzer.com/source-code/#skypetrojan
According to his site, he removed a plugin system from the source as well as code to bypass firewalls, but he'll add it back in at a later date.
From looking at the source, this is heavily geared toward Windows, so the current iteration of the source doesn't affect OS X at this time.