Summary: Congratulations to Skype. Last week it marked quite a milestone: 100,000,000 registered users. That`s just the number of downloads, though there aren`t necessarily that many regular users. Still, at any moment, several million people in the world are online using Skype whether for free Skype-to-Skype voice calls, instant messaging chat, video calls, or to take advantage of the premium services that actually earn Skype its money. By Davis D. Janowski, PC Magazine