Not quite sure where this came from, but it's an interesting list of books to aim to read this year.

The 2016 Read Harder Challenge List
(annotated where I've read books in the relevant category in January 2016)

• Read a horror book
• Read a nonfiction book about science
• Read a collection of essays
       Baptism of Fire: The Birth of the Modern British Fantastic in World War I, ed. Janet Brennan Croft
       Perilous and Fair: Women in the Works and Life of J. R. R. Tolkien, eds. Janet Brennan Croft and Leslie A. Donovan
• Read a book aloud to someone else
• Read a middle grade novel [ie aimed at 8-12]
• Read a biography (not memoir or autobiography)
• Read a dystopian and post-apocalyptic novel
       Streetlethal, by Steven Barnes
• Read a book originally published in decade you were born [the 1960s]
• Listen to an audiobook that has won an Audie Award
• Read a book over 500 pages long
       No Official Umbrella, by Glyn Jones (710)
• Read a book under 100 pages
       The Story of Ireland, by Brendan O'Brien (96)
       Flatland, by Edwin A. Abbott (96)
       Rupert Wong, Cannibal Chef, by Cassandra Khaw (95)
       A Day In Deep Freeze, by Lisa Shapter (74)
       Bételgeuse v 3: L'Expédition, by Leo (48)
• Read a book by or about a person that identifies as transgender
• Read a book that is set in the Middle East
• Read a book that is by an author from Southeast Asia
       Rupert Wong, Cannibal Chef, by Cassandra Khaw (from Malaysia)
       Sorcerer to the Crown, by Zen Cho (also from Malaysia)
• Read a book of historical fiction set before 1900
• Read the first book in a series by a person of colour
       again, Streetlethal, by Steven Barnes
       again, Sorcerer to the Crown, by Zen Cho
• Read a non-superhero comic that debuted in the last three years
       I think Saga counts? Though perhaps the spirit of the challenge is to find a new one. Thanks to drplokta for clarification.
• Read a book that was adapted into a movie, then watch the movie and discuss which is better
• Read a nonfiction book about feminism or dealing with feminist themes
       again, Perilous and Fair: Women in the Works and Life of J. R. R. Tolkien, eds. Janet Brennan Croft and Leslie A. Donovan
• Read a book about religion (fiction or nonfiction
       possibly Jews vs Aliens, ed. Lavie Tidhar and Rebecca Levene
• Read a book about politics, in your country or another (fiction or nonfiction)
• Read a food memoir
• Read a play
• Read a book with a main character with a mental illness

Most of these are represented on my reading list already. I would not have thought to look at the Audie awards, but a quick skim of their website looks very encouraging. The biggest challenge will be finding someone who is willing for me to read an entire book to them. I may have to borrow a small child.