Apple has quietly launched iTunes Preview, a feature that shows what music is available on iTunes from the convenience of your Web browser. Yes, even Internet Explorer 6. iTunes Preview lets anyone browse through the entire iTunes catalog’s worth of music, info, and user reviews for any region.
You can access iTunes Preview in one of two ways, either through iTunes Charts on Apple’s Website or automatically through any link generated from the iTunes Store’s Copy Link feature.
So Apple has decided to reach out to those who would like a taste of what's in iTunes without the need of iTunes being installed. However, as noted by Nicholas Bonsack, Macworld.com, it currently only allows previewing of music