NATEtheGREAT

Super Hi-Fi Audio Disks: Another Failed Sony Media Standard

You can add their portable music mp3 player to the list. The one I have is a NW-E005F. You're supposed to use their proprietary software to download music to the player... but thanks some smart guy, there is a way to avoid using the software. I would have went with another brand had I not found the work-around. Will never learn I guess.