blue ones
I bought my wife a blue one with an [link|http://www.griffintechnology.com/products/itrip_mini/|FM transmitter] a couple a months ago. She thinks it's nice. It's ok. Not quite the reaction I was looking for. Our 9 year old daughter on the other hand loves it. She's enthralled. Our 7 year old son lost interest since it can't be thrown, tied, taped, or anything else fun.
Have fun,
Carl Forde