Just found out that CarinaSoftware will be offering SkyVoyager, the pretty massive iPhone planetarium, for free in the AppStore on Monday July 20, in celebration of the moon landing 40 years ago. This is an amazing offer. From their website (love copy/paste) SkyVoyager is a powerful planetarium program for the iPhone and iPod Touch. It is designed for both beginners and advanced users. It contains a database of 300,000 stars to 10th magnitude, and 30,000 deep sky objects, including the entire NGC and IC catalogs. It renders the planets and moons in detail, using NASA mission imagery, and includes a database of several hundred asteroids, comets, and artificial satellites. (Furthermore, their Mac OS program SkyGazer will also be offered for free). These have got to be worth nabbing on the day.