June 19, 2008 - Music downloads hit the 5 billion [b] mark.
Sep 8, 2008 - Apple introduced the iTunes 8 software and with it the Genius feature that proposed music based on user playlists. "Genius button is a great way to painlessly create playlists of related tracks," reported Macworld in a review.
March 19, 2009 - High-definition movies were added to the store. The higher-quality movies cost $1 more than standard definition titles.
Sep 9, 2009 - Apple added Home Sharing to iTunes 9, allowing songs, movies and TV shows to be copied or streamed between up to five authorized computers, so they didn't have to be purchased several times.
Feb. 24, 2010 - The 10 billionth song was downloaded from the iTunes Store.