Skype has released the final verison of Skype 2.0 for Mac OS X.

Features include:

Make free calls to anyone else on Skype, anywhere in the world.
Chat with one person or have a group chat with up to 100 people at a time.
Conference call with up to four people for free. (A Mac computer with G4 800 Mhz processor or faster is required)
Easily send files and photos to each other.