Skype has introduced version 1.3 for the Mac, incorporating a slew of new features including group chat.
BTW, to address the tons of rumors floating around that Skype is going to be acquired by eBay. This makes some sense from an e-bay perspective, in that they could presence-enable their users. The idea being that if I have a question about a product being auctioned I can use my eBay Skype client to see if the seller is on-line and then establish either an IM or voice chat session to ask my question.
There of course is also the possibility for live auctions using Skype IM or voice chat services.
Finally, there is also the chance that eBay just wants to diversify, and that buying Skype helps it enter the IP telephony space (not excluding the ability to both preserve Skype as a stand-alone service but also integrate it into the auction site).
I suppose we'll have to see if the rumors are true, but either way, it shows the growing importance of Skype to the VoIP landscape.