Interesting and useful information for writers, though not entirely surprising. Looks like most people (from my LJ-friends survey pool) still much prefer print books, and recommendations from friends (and others, per Amazon's method) are still how we usually find new books and authors.
The most interesting observation I made (to be borne out by experiment, of course) is that giving away books with a means to get donations from downloaders might well bring in more revenue than selling ebooks. Ponder that for a bit.
Thanks to all who contributed!