A new iPad app launched this month called Planetary. It visualizes your music collection using the solar system as a metaphor and it's visually stunning. It also seems gimmicky, at first glance. The concept is that stars are music artists, planets are albums and moons orbiting a planet are the album tracks. You can browse and listen to your music as if it was a universe. One reviewer of the app on iTunes coolly dismissed Planetary as "visually appealing but useless." With probably unintentional irony, the reviewer gave Planetary just 2 stars.