John Battelle is interviewing Marc Andreessen and Yahoo's COO Dan Rosensweig right now. Here is an MP3 of part one of the discussion. Here is a copy of the Mp3 of part two.

Marc talked about EBAY locking down users, and never letting them take their reputation out of the system. He called them a plantation owner, which got a big laugh.

Dan talked about the re-launch of My.Yahoo.com, and ending the "data lockup" model because users don't want their data locked up.  He believed that the travel space is the next walled garden to come down. Don't use data as a weapon he said.

Marc called him on this saying that they don't have open APIs.

Dan said you can't do things over night (i.e. opening up APIs). However, he was clear that he is open to it.

Marc talked about being able to pull out your search history, your reputation system, etc. form online services.

Marc talked about better products changing user behavior instantly due to word of mouth and low/no cost of switching. He cited Google search and mobile handsets as examples of people switching instantly.

John asked about the "Web OS" meme—claiming it was put out there by Google. Marc felt that Google is being lead into a head on collision with Microsoft—he joked that he had been there before (i.e. Microsoft and Netscape).

Dan got in a great one-liner saying "how did it turn out?" (obviously Netscape got killed).

Marc got in an even better one-liner saying "You're going to find out." (i.e. Yahoo was going to get killed by Microsoft).

The most important part of the discussion was Dan saying that he thought a WebOS would create tremendous value for users. Marc agreed that it would be huge. Hmmm… maybe Yahoo and Google will be taking over the desktop.