NASA for iPhone [Free - iTunes link] lets you:
enjoy fast, direct access to accurate, up-to-date space mission content from a wide range of U.S. Space Agency sources – all in one easy-to-use mobile platform. [...] Receive and share dynamic NASA mission updates, out-of-this-world images, and intriguing video links. Follow the path and progress of space exploration in real time while tracking the global orbits of your favorite spacecraft, all in the palm of your hand.
NASA Ares I-X set for launch tomorrow morning watch it on tv or iPhone users you can check out the Ares I-X via the NASA iPhone app!