3G vs. Wifi
"Of the two devices it's the cheaper Wi-Fi only version on review here and, in my opinion, it's clearly the one to get. Surely, even the most avid reader doesn't get consumed by the burning urge to buy literature so suddenly that they need a cellular link"
That's true, but it's the fact that the 3G connection, and any data usage, is free once you've paid the £40 premium for the 3G Kindle that swung it for me.
I was using it on the train last night to check up on my email and RSS feeds.
OK so I could have done that on my phone, but, when I'm travelling through Europe or any other country with a data connection available I can still use my Kindle there and the data is still free - no massive roaming charges. Brilliant.