Not-iPods just completed a series of “iPod Killers for Christmas” articles, part one, two, three and four.

There are many cool devices, but I think I'd prefer a flash based unit because they're generally better for running. The one I'll end up buying should have at least 1 GB of flash memory, must be able to play both MP3 and Ogg Vorbis files, work as a USB mass storage device with any OS and it would be really nice if it was weather-resistant too, but it's more important that it's compact and easy to use.