In terms of music apps, Napster lagged behind the competition until its caching-capable mobile program hit the iTunes music store. Luckily, what finally did arrive is a pleasure to behold. Clearly a lot of effort went into designing the look and feel of the Napster for iOS app. The interface is quite simply one of the best we've seen from a mobile music program, with options laid out in a handy grid of large buttons and a slick, graphically appealing theme. Sadly, sound quality falls very short of the offerings from Rhapsody and Slacker.