Real life, non-techie users care almost exclusively about “content.” They want to watch American Idol and listen to Jay-Z. They don’t really care how that content is delivered or what platform it’s on. Which is why Joost failed, and why so many video and music-related startups have struggled. Skype, on the other hand, didn’t have significant dependencies on other companies – its content, like its technology, was truly peer to peer.
Chris Dixon — Why did Skype succeed and Joost fail?