EDIT: NOT NEEDED ANYMORE!!! CHECK MY THREAD HERE: http://ipis-osx.wikidot.com/forum/t-152367/get-microphone-and-audio-in-working
Soundflower is a MacOS system extension that allows applications to pass audio to other applications. Soundflower is easy to use, it simply presents itself as an audio device, allowing any audio application to send and receive audio with no other support needed.
JUST DOWNLOAD AND INSTALL THIS APP —> http://code.google.com/p/soundflower/
So now you must have into your sound pref something like:
With two Soundflower :) these are our virtual sound hardware.
Then launch Skype, and tada!