This one-month surge is primarily attributed to a high level of strong post-holiday e-Book buying, or “loading,” by consumers who received e-Reader devices as gifts. Experts note that the expanded selection of e-Readers introduced for the holidays and the broader availability of titles are factors.And also reported on Engadget:
US sales of e-books generated about $90.3 million in revenue in February -- roughly triple the sales reported in the same month last year. To boot, they were the dominant format for trade titles, a category that includes adult and children's works. Meanwhile, printed books declined 34 percent and 16 percent in those respective areas, with gentler, single-digit drops for education and religious titles.