iPod

I still think about getting one of these, though with a suitably large SD card my iPAQ would do the same thing mostly, admittedly with less storage and battery time. Seeing as I currently own four 256Mb SD cards and two 512Mb SD Cards I have a few options.

iPods are allegedly pretty tough, though not nearly as tough as SD cards, or the other card formats for that matter. (The link is to an Acrobat PDF).