cowon iaudio - i have an older model, 60 GB, but suspect there's probably a much newer version out now.
filesystem instead of an itunes-style database.
plug and play hdd, can store any type of file on it - drag and drop. worked instantly for me under xp and xubuntu - no drivers/software.
good build quality.
excellent sound quality for an mp3 player.
has a wackass adapter for charging/attaching the usb cable.
no album art feature.
takes a while to boot after you make changes.
i like it. if they got rid of the dumb adapter, and it displayed album art, i might even buy another one. just the use i get out of it as an highly mobile external hdd made it worth the price to me.