I was about to necrobump that topic again as well. Soundcloud seems to be eaten alive by the majors. That and odd decisions like not embedding the player anymore on Facebook made me want to feather my own nest.
That's a great article. I'm looking into hearthis.at at the moment and will Skype with the admin this week about what they can improve.
What are you using right now?
Mixcloud is really awesome but I want one platform for mixes and tracks.