Think Headtrip headset-based MP3 player

The Think Headtrip from Think Computer Products isn't the first headset-based portable audio player, but it's almost certainly the cheapest. Starting at $49 for the 64MB version, the player is Windows and Mac-compatible, and supports MP3 and WMA. A couple of downsides: If the sound in the headphones bites, there's not much you can do about now, is there? Also, though versions of the Headtrip hold up to 256MB (with 512MB and 1GB models promised), there's no memory-card slot, so once you buy one, there's no upgrade path (though that is sort of part of the deal when you buy a combo player like this).