Finally, Sony has released the Official PlayStation App at App store for iPhone, iPod and iPad users and at Android marketplace for Android users that too for free, isn't it simply cool?
I'm using it on my Android and belive me guys it's really standard quality application to have. Specially for gamers it's really useful widget. You can simply login with your PSN ID and can see your friends and trophies. You can also read PlayStation Blog to be updated with PlayStation games news and previews. Sony has confirmed to bring more features in future updates.
To get the application just launch your App store or Android marketplace application, search it and download it for free.
Well here is some screenshots: