I have a 20gb iPod, so far I have around 1300 songs on there, its about 1/3 full. And I love it, it really makes your CD collection osbolete if you get the FM transmitter with it. I bougt mine in the spring so I wouldn't have to take my huge book of CDs with me to Europe. Its really nice because if you want to listen to a different band, you don't have to dig out another CD, then file away the old CD, its just so easy. And you can just shuffle all the songs which is nice for when you are feeling indecisive but want to listen to some music, it will pick for you.
The newer iPods released this summer now have 12hr battery life, compared to my 6hrs. And some other improvments.
Bottom line is it is probably the best money I've spent on an electronic device. It's part of my standard load-out, along with my cell phone, lip vaseline, knife, etc (and soon to be Sig 226
)
Brian