Pandora Version 2 was released today today. In addition to many new features (bookmarking, station editing, playlist improvements, etc.), Pandora v2.0 includes a free, ad-supported version. Listeners have the choice to subscribe and stay clear of ads, or use the free service, which will gradually incorporate advertising. What does this mean for you? You can now come back and listen to Pandora as much as you’d like for free–and all the stations you’ve created remain intact. [Link]