I have a 32Gb iPhone 3GS, and I just picked up a new 16Gb Green nano and a new 4Gb Shuffle. Each device is completely full with music, but there are specific places that I use each device. There are places (like the gym) that I don't want to use my iPhone due to risk of sweat/dropping (I'm a competitive powerlifter, so lots of weights moving around to potentially smash the phone), so I use the Nano or the Shuffle here. I don't really care about the video aspect of the Nano, but I do love the FM aspect of it. I know that seems really weird on an mp3 player, but I like a lot of the local stations, and can now listen to them at work quietly. And as part of my typical "getting dressed" routine each morning, I clip the Shuffle to my shirt collar, so that I always have some form of music with me at work/wherever. It's so small and plain looking that it doesn't stand out or look out of place clipped to my shirt during meetings/etc. This is actually the 2nd 3rd Gen Shuffle I've had. And I've loved the 3rd Gen Shuffle, despite the the headphone controls. I just picked up the Belkin 3rd Gen Shuffle headphone adapter a few weeks ago at the Apple Store, so now I can use my $450 Westone headphones with both my Shuffles, which makes it a great, tiny mp3 player.