"If I could fashion my ideal music solution, it would would be Rdio with optional cloud storage where I could dump my mixes, mashups, etc. and then access via the Rdio front-end. (extra credit: if I could easily save URLs to this service and stream from that interface, I’d be totally covered but I recognize that’s not for everyone)"
100% agree. I just wrote about how I will often buy albums on Bandcamp and then not download them, because I’m tired of finding physical space to store them. If I could store my purchases in Rdio (plus add the unofficial remixes and mixtapes available on Soundcloud), that’d be perfect. This will happen. Just a matter of who will get there first.