So I'm sick of hard drive players for a few reasons - one of them being the mechanical parts tend to frak up when I'm running. Plus, I suspect flash based drives would last longer in terms of battery life, yeah? Also, I'd like a more portable solution in terms of doubling as a USB stick flash drive. About 10gb or more is ideal.
So suggest away! I'd prefer a Windows/Linux explorer drag and drop player, as I have issues with iTunes and SonicStage (and similar), but it's not critical.
And finally, I think a flash drive is rather fitting to go running with, no? Run, Flash, run!