Latest Study of Ebook Reading

The Book Industry Study Group (BISG) has been conducting surveys since November 2009 to track book consumer attitudes toward ebooks. They just announced the results of the latest survey. (Survey results available at $500 and up, depending on how much detail you want.)
 http://www.bisg.org/news-5-631-press-releasebisg-study-reveals-e-book-buyers-are-accelerating-their-move-away-from-print.php

"The surge in sales of e-reading devices like Amazon’s Kindle during the 2010 holiday season launched a turning point in e-book history according to the Book Industry Study Group (BISG).  The second installment in VOLUME TWO of BISG’s closely watched Consumer Attitudes Toward E-Book Reading survey shows the percentage of print book consumers who say they download e-books jumped from 5% in October 2010 to nearly 13% in January 2011. In addition, fully two-thirds of survey respondents said they have moved exclusively, or mostly, to e-books over print. Finally, despite declining sales of pricier hardbacks, overall spending on books shows an uptick over the past six months, with 44% of respondents reporting higher unit purchases and 34% reporting higher overall spending on a combination of print books and e-books."

And just what type of ebooks are people buying?

"Fiction continues to dominate downloads, with literary fiction, science fiction, and romance each comprising over 20% of all format purchases."