Now that the screen no longer works on my Zen Portable Media Center, I basically just have an iPod shuffle... except this thing has a 4" screen and weighs 3/4 of a pound.
The size and weight haven't actually been a problem yet; I just wish I had a screen so I could put more than one or two playlists on it and still find them. (20 GB is useless without a menu.) I'll probably get a new player later this year. I do not think that it will be an iPod or a Zune.