There is a new music browser application called Songbird that is going to be released soon. One feature of this software is that it connects to niche online music stores (ie, not iTMS, Yahoo Music, Rhapsody, Napster 2.0, MSN Music). One music store it appears to works with BeatPort. Songbird was reviewed today on BoingBoing. And in one of the screen shots, it shows it working with BeatPort.
Here is the post on BoingBoing.