My wife is looking at the kindle and they are bragging about 3G connectivity but it is only "experimental" for web browsing. I imagine they are fishing for another product line and I am sure the bandwidth will not be free as it is now.
One the hardware manufacturers are trying to do is avoid one product cannibalizing the market for another product.
In this case they don't want cheap book readers competing with more expensive tablets, even though they are essentially the same box with a different software load.
