When my sisters and I were young we had a favorite book of poems: Piping Down the Valleys Wild (edited by Nancy Larrick). I was lucky enough to come across this book at a garage sale several years ago. Some of my favorites include:
Get Up and Bar the Door (Anonymous)
The Owl and the Pussycat (Edward Lear)
Cats (Eleanor Farjeon)
Every Time I Climb a Tree (David McCord)
My Shadow (Robert Louis Stevenson)
Daddy Fell Into the Pond (Alfred Noyes)
Father William (Lewis Carroll)
It was that collection and A.A. Milne that I believe fostered my love of poetry. To this day I make sure I always have a copy of When We Were Very Young in the house. Favorites from that include:
The Four Friends
The King's Breakfast
Poetry is meant to be read outloud. I read these and many others to Boy in his youngest years but, alas, he finally asked me to stop. Since then I've read them to the cats.
Now I know everyone loves Shel Silverstein, and I do too, but the other children's poet I adore is Jack Prelutsky. I am especially fond of his book The Dragons are Singing Tonight.