I have a separate book for each activity in my life which permits reading.
When I am at the YMCA on the elliptical machine, I read A Heartbreaking Work of Staggering Genius, by Dave Eggers.
When I am on the bus I read Sophie's World: a novel on the history of philosophy by Jostein Gaarder.
In bed at night while waiting to fall asleep I'm reading A Maiden's Grave by Jeffrey Deaver.
It's fantastic. And I don't mind finishing a book because I have dozens of unread books in my apartment.