A recent report from market research company NPD Group shows that purchasing music from Apple’s iTunes Store is more popular among 9- to 14-year-olds (also called tweens) than illegally downloading music over the Internet. In the report, NPD said that 70 percent of tweens are now using legal means to download music. iTunes, the most popular such service for this age group, was used by 49 percent of those surveyed. (MacWorld)