On ps3, you used to have to use the web browser and just open a web page with Pandora. It was extremely inconvenient because it was basically the desktop version, using the ps3 controller. Shitty.
Well they just rewrote an HTML5 version, which is optimized to work in the browser window. It's as close to a dedicated app we can get at least until PS4. It's actually quite beautiful and works very well. If anybody uses pandora on their ps3 you should check this out.