Skype for Mac got an update yesterday
bringing it to version 5.1. The recommended upgrade allows for easier group calling thanks to the ability to focus in on active speakers within a conference call. You can now dial recently called numbers direct from the dial pad too, which should speed up calls to frequently used numbers or contacts. A call quality feedback mechanism has also been added that can be used to rate the quality of the call (not the conversation) after it's finished, while contact groups are now shown on the right hand side giving you more space in the Skype side bar for recent events.
Skype 5.1 for Mac also comes packing a plethora of bug fixes, including proper FireWire connected iSight camera detection. You can download Skype 5.1 from here
, or check for updates directly within Skype to initiate an auto-update.