Search Internet sites like Amazon and Alibris. These supersellers list current bestsellers, genre titles like romance and mystery and all types of non-fiction. You'll find textbooks, used books and electronic books on these popular websites. Browse around for awhile and choose appealing books to add to your wish list or shopping cart.
Talk to friends and co-workers about their favorite books. Asking someone with similar interests about what they read can lead you to some pretty surprising finds. If they describe a book that piques your interest, make sure to get at least the complete title and author's last name so you can find the book at your local store or via the Internet.
Spend a leisurely afternoon at your local bookstore. Browse different sections of the store, even ones that you wouldn't normally consider. Sometimes it's better if you don't have something specific in mind. You may end up buying a good history book about female pirates, for example, that you couldn't find by checking just a few aisles in the store.
Check out good book reviews. Look in your local paper or on literary websites and pay attention to the reader reviews in addition to the professional ones. The ratings won't tell you as much as the text of the review. A book with a two star rating may have elements in it that appeal to you even though the reviewer didn't like them.
Attend a book club meeting. The group leader will choose a book for everyone to read and discuss. The coordinator's taste in books may not be the same as yours, but you'll expand your literary horizons. You might even make a few good friends along the way. Reading doesn't have to be a solitary activity.