Apple iTunes compare

With its enormous catalog of on-demand streaming music and its built-in social features for discovering new tunes, Spotify is an absolute must-have for audiophiles and casual listeners alike. But free users, beware of intermittent eardrum-piercing ads.

With an elegant interface, weather information, and interactive maps, Yahoo Weather is a must-have for weather watchers everywhere.

Amazon Instant Video is only instant if you're a Prime subscriber or once you've already purchased content from Amazon's Web site, but the lower cost for some videos might make it worth your while.

Apple iTunes 7 is a required upgrade for movie buyers and owners of a new iPod or iPhone. Its refined interface, particularly Cover Flow, and useful new features trump the fact that the application is processor-intensive.