Wow! How things change. From the PEW Project for Excellence in Journalism (PEJ).

Over the last year, tablet ownership has steadily increased from 11% of U.S. adults in July of 2011 to 18% in January of 2012, according to PEJ data. Currently, 22% own a tablet and another 3% regularly use a tablet owned by someone else in the home. This number is very close to new data, released here for the first time, conducted in a separate survey by the Pew Internet & American Life Project on July 16 through August 7 2012 that found 25% of all U.S. adults have a tablet computer.

And over half of those tablets are iPads.