Here is an app for all the music lovers who just cannot get enough of any artist, genre, track or album. Yes, we are talking about Slacker Radio for iOS. This app allows users to browse through their large libraries of songs, almost 2.4 million tracks without crowding the memory-space on the iPod. Developed by Slacker Inc., this app puts a vast collection of artists, tracks, various genre radio channels, and the option to add customized channels anytime, anywhere. This one is an iOS universal app, so users with both iPhone and iPad are in for a treat.