LibreDigital, which you've likely never heard of, supplies technology that delivers eBooks from publishers to readers' gadgets. HarperCollins, Simon & Schuster, Hachette, Wiley, The New York Times, Wall Street Journal and USA Today are among LibreDigital's clients, which include six of America's top 10 book publishers. LibreDigital offers its technology as a service rather than requiring publishers to configure servers and install and maintain software themselves.

LibreDigital, which you've likely never heard of, supplies technology that delivers eBooks from publishers to readers' gadgets. HarperCollins, Simon & Schuster, Hachette, Wiley, The New York Times, Wall Street Journal and USA Today are among LibreDigital's clients, which include six of America's top 10 book publishers. LibreDigital offers its technology as a service rather than requiring publishers to configure servers and install and maintain software themselves.

The round was led by Triangle Peak Partners, a first-time investor in LibreDigital, and prior investor Adams Capital Management. The company's other key investors include HarperCollins Publishers, The New York Times Company and Noro-Moseley Partners.

"Demand for books & newspapers in digital formats is out-pacing supply," Triangle Peak co-founder David Pesikoff said in a prepared statement. The amazing thing about this over-the-top statement is it's true. Consumers seem frustrated by the limited options for reading newspapers and books in an electronic, portable format.

LibreDigital chairman Martin Neath (he's a partner at Adams) claims the market for e-books and similar electr0nic editions of printed materials will exceed $2 billion by 2012. That'll require something hotter than the Kindle to read it on, which could just be the smartphone in your pocket.

(Disclosure: Paul Boutin is a freelance contributor to The New York Times and The Wall Street Journal.)