Edward's Overwhelming Overnight by Rosemary Wells
Piggie and Elephant series by Mo Willems
Elephants of Africa by Gail Gibbons (or any other nonfiction on elephants)
Humpty Dumpty (we read a version illustrated by Annie Kubler)
First the Egg by Laura Vaccaro Seeger
An Extraordinary Egg by Leo Lionni
The Cow that Laid an Egg by Andy Cutbill
Green Eggs and Ham by Dr Seuss
I Can Do Anything That's Everything All on My Own (Charlie and Lola) by Lauren Child
Step Into Reading books about WALL-E
Egad Alligator! by Harriet Ziefert
Edwina, the Dinosaur that didn't Know She was Extinct by Mo Willems (great choice if you focused on dinosaurs the week before for letter D)
Later I came up with a few more E ideas, but didn't get a chance to search for titles. These included the Earth, earthworms, eyes, and ears.
Elmo books are also a great place to look for letter E; since Elmo talks in the third person, his name appears a lot so there are extra E's!
If you are lucky, you might study the letter E right around Easter, which is excellent not just because Easter starts with E, but it makes a lot of the egg books and activities a bit more natural.
Some Easter titles:
The Golden Egg Book by Margaret Wise Brown
Fancy Nancy's Excellent Easter by Jane O'Connor
Max's Easter Surprise by Rosemary Wells
Spot's First Easter by Eric Hill
This week a couple happy coincidences happened. When Mike and Natalie were watching Sesame Street early Sunday morning, it just so happened that the letter of the day was E. They both got a kick out of that. Also, a local radio station is playing all their songs from A - Z. Several times we've heard them announce the letter and Natalie has been excited.
Easter egg matching
I saw the idea for matching with using plastic Easter eggs on Pinterest. The idea is to separate the two halves of the egg. On one half, write uppercase E and on the other write lowercase e. Do this for several eggs. Mix them all up. Let your child put them back together. You can hide the eggs to make it more fun. To make it harder, use mostly eggs of one color and alternate which half of the egg gets upper or lowercase.
Letter E play list: