English rock band Radiohead has released its latest album, In Rainbows, on its own through its website, echewing iTunes and other label-driven digital music services. While the band is selling a “discbox” set that includes the album on physical media as well as other extras, the digital download version, which comes as 10 DRM-free 160kbps MP3s, is available for as much or as little as the customer would like to spend, save for the £0.45…