Pocket Universe has always been one of the best of the astronomy apps, and I reviewed the earlier version positively. I like the use of augmented reality to overlay a star chart on the real sky, and there are lots of features like astronomy news, a planning module for any particular night, and quick and easy guides to finding visible comets and other nighttime events. With some nice clear summer nights there are plenty of things to see and appreciate.
The app has now been updated, and is one of the first science apps to use the iPhone 4 gyroscope. According to John Kennedy, who wrote the program, using the gyroscope speeds up orienting the phone position, because the internal compass is a bit slow and prone to interference.
The app doesn't need internet access, except for astronomy news and linking to Wikipedia articles. All the star charts and graphics are contained in the app. Pocket Universe supports a night vision mode, which turns the stars and object labels red, keeping bright glare away from sensitive eyes.