Michael Robertson now launches a web-based media player called ajaxTunes. When I first read it I though "Why a media player?" I still am not sure, on this issue. Anyways, the features:
lets you play, pause, forward and rewind high-quality streaming music encoded at 192kbps over the Internet from any computer.
It has a demo account which has a bunch of songs pre-loaded so you can check out the player. Check it out www.ajaxtunes.com