Got my invite a couple of days ago but I couldn't figure out how to upload my entire music folder on my server. Found out how to do it today, just click on it, lol.
Uploading now, it's taking awhile but it is 4,500 songs. Love the new Music App from the Marketplace too. I just didn't want to upload all of my music to my phone, it wouldn't hold it anyways, this eliminates that.
With Netflix and now this I am glad I got rid of my iPhone when I did. Android is where i'm staying for the foreseeable future.