The Literature of Honor for Boys
The Literature of Honor for Little Boys
Books for Boys - A Show and Tell
Read-Aloud Revival
Orange Marmalade
Redeemed Reader
Reshelving Alexandria (this a paid membership site, but there are some free resources as well)
1000 Good Books List
John Senior's 1000 Books
Classical Reader (this one is filtered)
Exodus Books Summer Reading Booklists
Mensa for Kids' Excellence in Reading
Beloved Books Favorite Children's Books
Living Books List
Ambleside Online (this is a homeschool curriculum, but there are lots of gems in each years' booklist - look especially under the 'Literature' and 'Free Reading' categories)
The Cambridge School Summer Reading List
The Latin School Summer and Enrichment Reading List
Eclectic Homeschooling (look under the 'Book Lists' tab)
Books about books:
Honey for a Child's Heart by Gladys Hunt
The Read Read-Aloud Family: Making Meaningful and Lasting Connections with Your Kids by Sarah Mackenzie
Give Your Child the World: Raising Globally Minded Kids One Book at a Time by Jamie C. Martin
The Read-Aloud Handbook by Jim Trelease
The Book Whisperer: Awakening the Inner Reader in Every Child by Donalyn Miller