I've had a few mp3 players before and never really found myself using them regularly.  But our new treadmill has a dock for and iPod and when I saw this iPod Nano 4'th Gen available cheap on Woot.com I decided to go for it. 

I LOVE this thing!  I've downloaded music, music videos, Dr. Horrible's Sing-a-long Blog, an audio book, podcasts, pictures, you name it.  It works great with iTunes, the sound quality is terrific and I can't believe how great the resolution is on the little full color screen!

It docks easily (using an inexpensive adapter) to my treadmill and I can use earphones or external...