The Pew Internet & American Life Project is out today with an epic report on the “rise of e-reading” — showing, among other things, that more than 20 percent of Americans have read an e-book in the past year, up from 17 percent at the end of last year.

There are tons of interesting nuggets in the 68-page full report (PDF) but the some of the most interesting are the charts showing preferences in e-reader and tablet usage — important insights given that Amazon doesn’t disclose sales figures for its Kindle lineup.

Even with competition from Barnes & Noble’s Nook, Amazon held steady at 62 percent of the U.S. market in January and February, down just 1 percentage point from late last year, according to Pew’s survey. Meanwhile, the Kindle Fire has captured 14 percent of the tablet computer market since its release last fall.

Notably, Microsoft Windows-based tablets don’t make an appearance in the chart below.