Similar to the Xbox Live Marketplace the Playstation 3 is going to have a store where you can get downloadable content and demos of upcoming games. This screenshot shows what the interface looks like, except some of those icons are placeholders. Downloadable content for Lair and Warhawk has not been announced yet, but you will be able to download extra matches for NBA 07.
You can also organize the available downloads by sorting them into the type of downloads either trailers, demos ore movie trailers.
On day one you will be able to download games for the Playstation 3, Blast Factor is announced as one of the titles and it looks like Calling All Cars (formerly Criminal Crackdown) from Sony Santa Monica Studios is coming out around launch.
This is a shot of the Playstation 3 web browser’s interface when you’re switching between web pages.