Pownce

When Kevin Rose, Founder of Digg.com does something, I figure I might as well pay attention to it. His new site pownce.com promises to be interesting. It reads,

Pownce is a way to send messages, files, links, and events to your friends. You'll create a network of the people you know and then you can share stuff with all of them, just a few of them, or even just one other person.

Sort of sounds like a social network site on steroids.

What does the word collaborate mean?
Is there anything that should be shared with people when you see them in person but not via the Internet?
What is the most important file that you have ever created? Why do you choose this file?
What is the most important email that you've ever sent? Why do you choose this email?
What types of characteristics does a person need to be a great Internet Entrepreneur?