I decided to play around with the Clementine music player today and was favorably impressed.
Clementine has current releases available for Windows, Mac OSX, and a variety of open source OSes.
The level of polish is fairly high: on OSX I only needed to drop an App to my desktop -- there was no need to install other libraries, or run an installer, and the download was a fairly trim 23mb.
They've done an excellent job of "keeping things simple", so it makes a nice antidote to the mega-featured iTunes.
The Magnatune support in Clementine "just works."
Magnatune is listed by default on the left hand side. When you click on it the first time, a list of albums is automatically downloaded from us, and after a few seconds, you're ready to go.
You click on artists to see their albums, and then simply play them.
They've also built support in for membership, so it's easy to download albums that you like, and you can set your preferred download file format.