We've spotlighted a few different Xbox Live browsers here on the site before, so here's a little console balance. PSN Go is an app designed to let you browse and control your PlayStation Network account (the account that you set up when you've got a PS3 connected to the Internet). It's unofficial (not created by Sony) and made by a third party, but you can log in with a PSN name and password and browse through your friend lists, gamer profile, trophy lists, and other PSN information.
Unfortunately, unlike most of the other "account browser" apps that we've seen, this one is priced a little higher than free -- it's US $1.99. While that's still not a lot, it is quite a bit to pay for just the opportunity to browse friends' lists when away from your console. Still, the app has a full in-app game database, and it's pretty well polished and runs great. Plus, it's getting updated; it's all set for the iPhone 4's Retina Display, and it's seen a few UI improvements and bug fixes already. If you find yourself browsing your PSN account quite a bit (especially when not at home), it's probably worth the couple bucks.