Andy asks Are Skype Calls Getting Better. He says that he's seeing better quality calls from Skype, and that more and more people are saying the same. I'll add my voice to the mix. Not only is the quality better, but it's consistently better. Moreover, quality in no-headset situations has reached the point where I don't think twice about taking calls without my headset. And Skype-In / Skype-Out calls are getting to be pretty good quality too.
Having said that, the quality of Skype plug-ins (and I can only speak to Skype branded plug-ins) still stinks. The Skype Internet Explorer plug-in has improved on IE 7, but I still don't use the Skype Plug-in for Outlook. There appears to be some kind of conflict between Skype and Plaxo when both are plugged into Outlook, and Plaxo is much more valuable to me than Skype.