I love my kindle, and also have the latest WiFi/3G one. I tend to bounce between books a lot, and it's nice to have them all in one spot. Plus, I tend to do a lot of traveling and with the 3G I can download books no matter where I am in all of 15 seconds
I also purchased the cover that has the built in light that is powered from the Kindle, it also is amazing, way better than trying to use an airplane light when you know it's just keeping your "neighbor" awake. They are pricey but it is definitely a great buy and I would recommend it to anyone