Sonys incredibly lackluster "app" for their PlayStation Network is an absolute joke (a very bad one, at that!)
So it was a huge relief to find an app that is feature-rich that covers the most important aspects of PSN mobile use: checking your friends list to see what everyone is up to and sending IMs to everyone. The trophy info is a great feature as well.
All in all, an easy recommendation goes out to this app and its author. Pay the (very small) fee and show support for this fantastic app. You wont regret it, I am sure!
GrayW0lf about YaPSNapp: PSN App