Earlier today, it was announced that Apple's iTunes Store has climbed to second place among all legal US music stores and is second only to Wal-Mart, according to a new study by The NPD Group. The research firm notes that about 29 million users, or 10 percent of all people acquiring music in the US, turned to paid download services throughout the course of 2007 and more often shopped at iTunes than through any other service. The total figure represented a jump of about five million versus 2006 and saw most sales go to buyers between 36 and 50 years old. This same segment largely drove sales of portable media players like the iPod.