Skype has just released a beta version of Skype 2.7 for the Mac with Chat groups, Address Book integration, auto-redial, improved file transfer, and more. Downloading it now. I live in Skype – it's my office number and preferred IM and video chat environment. I also use Gizmo Project (especially on the Nokia N95 and N800) and a number of IM clients but the bulk of my contacts and friends are on Skype so that's where I look first. These enhancements will make it all the more useful and bring things more on a par with the capabilities I already enjoy when working on the Tablet PC.