So Google's finally unwrapped its Music Beta service (currently by invite only, and only in the U.S.), which promises to give you "instant access to your personal music collection without the hassle of wires or syncing." All you have to do is "(a)dd your music collection and listen on the web or any compatible Android device."
This is My Next has scored itself an invite and posted a hands-on summary and video. According to their preview the service still needs work:
In a nutshell, the beta label is well-deserved at this point. On both Chrome and on my phone, I was really pleased with how quickly and effortlessly tracks started streaming over 3G… but the setup process isn’t without its hiccups.