If you live in Wrigleyville/Lakeview and believe in supporting locally owned businesses, then you can't afford to miss Unabridged Books. This longtime Lakeview business has a terrific selection of fiction and non-fiction books (including a sizable gay and lesbian selection).
Unabridged Books has a great reputation in the literary community, and well-known authors frequently make it a stop on their book tours for readings and signings.
I particularly appreciate the handwritten notecards taped to the shelves adjacent to many books, describing books that a particular staff member recommends.
Don't be deceived by the relatively small storefront appearance -- the selection also extends into the basement.