Late last summer I started working as a consultant with Echo Networks, which is a consortium of larger retailers who banded together to create a common infrastructure to launch an iTunes competitor. I was attracted to the linkage between online and offline and thought that the foot traffic in stores, combined with POS integration, could be a powerful tool in bringing digital music into the mainstream(at least paid digital music). So things didn't quite work out the way it was planned as shown in this article today in Cnet, and in this one in Techdirt.
Ok, so some kind of commerce has to eventually happen online with music, but the current ones don't seem to have much steam from my perspective unless you can sell iPods or something similar. It's interesting to see how fast ringtone sales are growing but it will be interesting to see what happens when devices have greater connectivity through things like Bluetooth and companies like Xingtone start getting adoption of their software.