Barnes & Noble on the iPad

"That's the word from the giant U.S. bookseller. There is already a version for the iPhone and iPod touch, and Barnes & Noble says customers can expect the free software around the time of the iPad launch."

I keep looking for news on Amazon.com doing the same thing, but alas, nothing. I may have to add a Barnes & Noble account to my book supplier list anyway, but I expect Amazon to come out with something similar since they already have a pretty good program on the iPhone. Why would they pass on the revenue stream this could generate?