According to Amazon.com, the Kindle (ebook reader) edition of The Mars Imperative is currently ranked #40 on its list of Bestselling Science Fiction Series. It's in good company, surrounded by books from Kevin J. Anderson, Anne McCaffrey, Alan Dean Foster, Vonda McIntyre, and Lois McMaster Bujold, among others.
Of course, "bestseller" is a relative term. I have no idea how many copies of any of those books are selling yet. (Just how many Kindles exist today?) Still, it's gratifying to see that people are buying my book in that format. (And the reader ratings are still at 4+-out-of-5 stars.)
Click here to go to The Mars Imperative Kindle Edition page directly.