Favorite Books for Toddlers

We've amassed quite a library in C's 15 months.  Here are our favorites:

This is My Tractor - a touchy-feely book with an audio button.  Cute illustrations, too.

That's Not My Lion - another touchy-feely.  C loved it when he was very small and now "reads" it to himself.

Goodnight Moon - Who doesn't love it?  C especially loves finding the mouse in every picture and likes to point out the balloon.

Sleepyhead, Sleepyhead - we got this for free in a Cheerios box, but I love the story.  The illustrations are less than captivating, but the story is pretty true to life, about a child delaying the inevitable bedtime. 

and the all-time, number one favorite...
Little Blue Truck - Our whole family love this book.  It has it all - a story with a moral, cute illustrations, nice phrasing (rhyming), and a lot of animal sounds.  We also have Little Blue Truck Leads the Way, but it's not as good. 

C has a really good attention span and loves to read.  Lately he's been more interested in longer books, like Curious George books and some of the classic Little Golden Books, like The Poky Little Puppy and The Shy Little Kitten.  We read them often when he was tiny, and put them aside when he started to want to turn the pages himself in favor of board books.  I'm so excited to have the longer books out again, and am so hopeful that C will love books his whole life.  What are the best books for boys through the years?  I loved the original Boxcar Children series and think a boy would, too, and I want to get The Dangerous Book for Boys one day, but what are a boy's must-reads?