Apple is convinced 3 billion iTunes downloads can't be wrong. Amazon took a long look at the iTunes model and concluded there was plenty of room for improvement. Launched two weeks ago, the Amazon MP3 store aims to beat iTunes by offering lower prices and DRM-free downloads. Amazon's store offers thousands of albums priced at $8.99 or less and a million songs priced at 89 cents.

Alternatives to iTunes: Clearer, Smaller and Free