Engadget had some time with the new 1GB PlaysForSure promotional MP3 player from Napster. This device is available for only $50 but you need to take a 1-year subscription to Napster's music service. It has a battery life of about 40 hours.
Of course, the player's first role is to support DRM10 PlaysForSure files from Napster To Go, but regular old WMA files and MP3s are supported as well, and it doesn't seem that Napster has made an effort to lock down the player from other services.
You can also play back MPEG-4 video on the tiny, but nice, 128 x 160 LCD, but you'll be on your own for content since Napster doesn't currently offer any vids. There's also JPEG and FM playback, and everything is accessible via a convenient and fast iPod-like menu system.