Have any Google Music users tried out any third party desktop clients? I played around with this API for awhile back when I had dreams of Google Music empeg integration, but getting Python to run smoothly on the empeg's limited hardware resources just isn't in the cards. (Perhaps now that I'm putting a Raspberry Pi in my car that could change.) I've also seen a couple of things in the Mac app store (one was called "G Ear", I forget the name of the other one) that purport to do the things you'd want a Google Music desktop app to do -- global hotkeys, new song notifications, etc. But I'm insanely picky about my music player apps, so I'm hesitant to plunk down the cash for an app that I can't easily get a refund for.