I really love Skype. If only all the folks on my instant messengers (AOL and Yahoo IM) had Skype and a PC headset/microphone combo like this Sony one I got. That last point is key, Skype and Yahoo’s audio chat are worthless unless you have a good heatset and microphone.
On a somewhat related point is anyone out there really into VoIP?! We’re looking to start a weblog on voice over IP here at Weblogs, Inc.