While Skype for Windows is at v3.5, version 2.7 has just been released into Beta for Macs.
Here's what's new, taken from the Skype blog:
Group contacts – organise your contacts into as many groups as you need. While there are some pre-defined groups (like Online, Waiting Authorization, Recently Contacted), you’re free to add new ones that suit your life. This should be a godsend to those whose contact list has ballooned to hundreds of Skype users. Explore this nifty feature under the cogwheel icon on the main screen.
See your Apple Address Book contacts in Skype - easily call or SMS anyone who has a phone number in their address-book profile. When texting, just make sure the number is one that belongs to a mobile phone.
Create and manage public chats by clicking on Chats in the menu bar and choosing Start Public Chat. A public-chat assistant will walk you through the necessary steps.
Auto Redial for busy or unconnected calls. When your call hits the busy signal, Skype will give you the option of automatic redial every two minutes until the call goes through. This setting can also be adjusted in Skype > Preferences > Calls.
Easy sound-level controls – when you need to tweak the sound level during a call, use a simple slider in the call window
Overhauled file transfer – wearing a more fashionable jacket, file-transfer now looks elegant and acts even nicer, especially when receiving many files at once advantage of a much-improved file transfer
Link to Skype, including further link for the actual download below.
UPDATE: The Skype service as a whole appears to be suffering some fairly major technical difficulties today (Thursday) so it might be wise to hang on to grab this download for 24 hours or so....