"So, you built yourself a large MP3 collection, but what use is it if you can only listen to it at home? Never fear, the solution to this vexing problem is as simple as getting yourself a portable CD-MP3 player. The only question that remains, is which one should you choose?
Well first off, there seem to be as many methods of storage as there are MP3 players. One of the most creative devices I've seen is the RioVolt by SonicBlue. Where other MP3 players either a flashcard, embedded memory or even a 2.5" portable hard drive, the Riovolt uses CD-R's, and even better yet, CD-RW's. And yes, it also plays regular CD's, which still have their place in the great scheme of things."