John's Nautical Literature Page - Provides links to lists of both fiction and nonfiction books concerning the age of fighting sail.  Especially good for readers of Patrick O'Brian and C. S. Forester who want more of the same.

Soon's Historical Fiction Site - The place to find historical fiction on virtually any subject, in virtually any historical period.  It is divided by subject and is continually updated.

Uchronia: The Alternate History List - This site offers an extensive annotated bibliography of alternate history titles, including forth coming books, series lists, and the yearly "Sidewise Awards" given out to the best in alternate history fiction.