In addition to the 3.2 million iPhones AT&T activated on their network last quarter they also switched on 400-500K iPad 3G. What's more:
It's "surprising" how many business customers are approaching AT&T about the iPad.
Business Insider quips that Microsoft should look out, but given the profit share Apple has taken on iPhone and the low margins of typical PC hardware, what damage they may not do to unit sales they may well do to revenue.
What's also interesting is that iPad users are consuming more data than iPhone users though less than 3G laptop users and 75-80% are on the unlimited 2GB plan.