According to a new study by Edison Media Research and Arbitron, both XM and Sirius have 61% awareness levels among American consumers. The research also showed some evidence of early use and interest in podcasting. Given a detailed description of podcasting, about one in ten people aged 12-plus said they had ever listened to an audio podcast, about half the number who had heard of podcasting. The podcast audience skews younger and more upscale than the general population. Nearly one in four Americans and more than half of teens own an iPod or other portable digital music player. [Billboard Radio Monitor] Thanks, Ben.