Skype your way around the globe

Skype is a new P2P telephony and instant message application created by Niklas Zennström and Janus Friis, the creators of KaZaa. The IM capability sounds like a good fit so people will be used to logging on and staying connected even when they are not performing the service’s primary use. Right now the app is ad-free but how long until it becomes infested like KaZaa?