Mac: Skype recently brought an overhauled interface and group video calls to the Mac with version 5. Today, they've released an update that continues to improve upon those changes, with better group call features and the ability to give Skype feedback.The update is a fairly minor one, containing mostly bug fixes (albeit helpful ones) and a few other changes. Most notable is the ability to better focus on the active speaker in a group call and the ability to rate your call quality after each call, letting Skype further improve their services. They've also added the ability to dial recently called numbers from the dial pad, as well as added contact groups to the right side of your address book for better organisation. Hit the link to read more about the new build.
Skype is a free download for Mac OS X.