iPod Shuffle Problem

Has anyone had any problems with the second generation iPod Shuffle?

I bought an iPod Shuffle in late April so I could run outdoors without trying to carry the iZombie around. I'd not had any trouble out of it until today. I was going to go for a run, but I turned it on and got nothing. No lights, no music, no showing up on my Mac.

I got caught in the rain running yesterday, but I know I had it covered the entire time and didn't notice any moisture on the casing when I got home, so I'm wondering if this was a battery issue. I'm dragging it back to the Apple Store tomorrow and hoping for the best.

... rats... :(