I was thrilled to get several comments- some from folks I know and some from people I have never heard from before. Franki suggested that she's done/is doing some "If you like..., you might also like..." C.A.T. said to check the Teachers' College Reading and Writing Project website because they do something similar called "Book Ladders." I did check the site, but didn't find this topic.
Several people offered to help put some book ladders together, so I say, "Let's go for it. The more the merrier."
Here are some lists I'm thinking about. These are just beginnings…Feel free to suggest stuff and I will add it, or suggest some new topics.
Junie B. lovers- Junie B. Jones, Moxy Maxwell, Clementine, Amber Brown, Ramona
Captain Underpants lovers- Captain Underpants, Diary of a Wimpy Kid, Diary of a Part Time Indian
Dog Lovers: Henry and Mudge, Leanin' Dog, Where the Red Fern Grows
Sports books: Matt Christopher, Dan Gutman, Mike Lupica
Horse Lovers: Marguerite Henry
Friendship: Pinky and Rex, Betsy, Tacy, Tib
This is just a start. Feel free to post a comment and we'll keep working on this.