I use a Nano on my bike rides. Works great and hardly weighs anything at all.
The cables are sort of annoying and it makes the ride a bit more dangerous since it limits my hearing, but I live out in BFE and see more cows than cars during my rides so it's not a big deal.
Make sure you get a skin so it doesn't get scratched or banged up.
"He's an ultimate warrior and that's what we see from him night after night." - Popovich on Manu, 2-12-06
"Getting a Sixth Man award is like being the best left-handed guard," Ginobili said. "I believe you're either the best player or not."