Um dude, they are scrubbing the $30 unlimited plan for the iPad. Did you not get the memo?
So I guess AT&T is reacting to the bandwidth issue. I'm sure they're trying to have people use their home network more for big downloads vs trying to use the 3G network to download video's and books. With WiFi so available, I don't see this as a huge issue. Business users who may rely on the iPad portability may get upset. As a consumer... no big deal.