I've mentioned it in earlier posts, but I like to emphasize once more the use of audio books; as they allow you to fill a lot of your otherwise-idle time (say, commuting, running, shopping etc.), you can effectively get a lot more 'reading' done.

Obviously, audio books are not very good (unfortunately) for really technical expositions, but one can use them to read a lot of fiction, popular science, history, that kind of thing. I've been doing that for a few years and I got more 'reading' done than I ever thought possible.

Another little 'trick' for reading more is to read PDFs and the like with 'autoscroll' turned on (at least Evince and Acrobat support this). Using autoscroll forces me to really concentrate and also allows we to sit back and 'experience' the book. Again, this does not work well for highly technical books, but quite well for more 'prosaic' material.