As with my other reading lists, this isn't comprehensive. I've picked books from several genres, as categorized by my store (so Bitten is in horror despite being urban fantasy). If you'd like to add books I've missed in comments, please do so.
Bitten – Kelley Armstrong
Wolf's Gambit – W. D. Gagliani
Shapeshifter – J. F. Gonzalez
Mammoth Book of Wofl Men – Stephen Jones, Ed.
Cycle of the Werewolf – Stephen King
Wolfman – Jonathan Maberry
Wolfman – Nicholas Pekearo
Full Moon City – Karrell Schweitzer & Martin Greenberg, Ed.
Frostbite – David Wellington
Silver Wolf – Alice Borchardt
Mooncalled – Patricia Briggs
Loupsgarous – Natsuhiko Kyogoku
Wolfsangel – M. D. Lachlan
Running With the Pack – Ekaterina Sedia, Ed.
Wolfbreed – S. A. Swann
Moonshine – Rob Thurman
Kitty & the Midnight Hour – Carrie Vaughn
Benighted – Kit Whitfield
Werewolves of Montpellier - Jason
Hunter's Moon – C. T. Adams
Full oon Risint – Keri Arthur
Hidden Moon – Lori Handeland
Master of Wolves – Angela Knight
Marked by Moonlight – Sharie Kohler
Come the Night – Susan Krinard
Howling at the Moon – Karen MacInerney
Claimed by the Wolf – Charlene Teglia
Confessions of a Werewolf Supermodel – Ronda Thompson
Werewolf's Guide To Life – Ritch Duncan
When Werewolves Attack – Del Howison