There are plenty of bookstores spread throughout the city. In case you need to get some travel info or even find some English children books, or an international magazine - you can easily find them in the city center or on Mariahilferstrasse.
If you take a look around on the metro, you're bound to find quite a number of people reading something. Whether a magazine, book or one of the many free newspapers, the Viennese love to fill idle time with words so you're bound to find a bookstore with something you would like to pick up and read yourself. Many places also have an English section.