XM Satellite Radio and Napster have launched a co-branded digital music store that will allow users to listen to 70+ XM channels and download music they hear on the service, reports Beta News (via MediaBuyerPlanner). Customers will also be able to browse the rest of the service's catalog, just as with Napster's regular service.

A portable music player with the capability of listening to XM and marking songs for later download will soon be available from Samsung. Users will be able to mark songs that they hear for download automatically when the device is synced.