MOG finally released a desktop app for OS X to accompany their web and smartphone-based players, which is great. But what makes it worth talking about is that it's one of the first non-Apple apps to offer native AirPlay support.
For people, like myself, who push their music around their home or office sans wires, integrated AirPlay support is wonderful because apps like Airfoil are no longer needed to facilitate that process. And As for the rest of the app, it looks identical to MOG's HTML5 web player, which is fine, because it's a nice looking UI. Plus, having a MOG icon on your dock to navigate to is nice when you have a million browser tabs and a million other windows open and you want to pick something different to listen to.