But a portable media player isn't the only way to enjoy iTunes content. There's your Mac OS X or Windows computer, first off -- if you've got a sound card and a set of speakers (and you probably do), that's all you need to use iTunes. There's also Apple's popular entry into the smartphone market, the iPhone. Or you can play your iTunes library with one of the few phones Apple authorized to access the service, such as the Motorola ROKR E1 phone. Some enterprising hackers have created apps that let you synchronize non-Apple products with iTunes, but these aren't supported by Apple and may not work with every version of iTunes. Apple's wireless networking hub, AirPort Express, lets you wirelessly stream iTunes music from your computer to your hub-connected home-theater speakers. With this setup, you control playback via your computer, iPhone, iPad or iPod touch.