Rdio Free; optional subscription $9.99 per month Rdio combines a redesigned, easy-on-the-eye interface, quality audio streaming, and lots of options into an iPhone app that music fans will love. If you choose to purchase a subscription to the service for unlimited mobile streaming ($9.99 per month, which also includes unlimited streaming through Roku and Sonos), be sure to do so via the website and not through the app itself.
LinkedIn Free LinkedIn provides an effective online network for keeping up with your contacts. It's easy to rely on LinkedIn more than your own address book for finding otherwise long-lost colleagues and business partners. Anyone in the job market will want to stay on top of LinkedIn for both its networking aspects and its wonderful database of job listings. It works well on an iPhone, although I like the full-sized LinkedIn iPad app even better.