Yikes, I see I have finally lost the Russian Coding Roulette game.
Oh, woe is me. Alas, alas!
My favorite book as a child was Attic of the Wind by Doris Herald Lund.
I tried to google to find a link to a review, but apparently after it was done in a video format the book seems to have vanished off the face of the earth. Here’s a synopsis from one of the links I was able to find:
The basic story is about what happens to all the things that float away on a breeze, from balloons to feathers to kites and laundry left out on the line. It says they all end up in the Attic of the Wind, waiting to be rediscovered.
The artwork is beautiful. I wish I could find a link to a picture of the book to show you how lovely it really is.
Also, I’ve never met anyone else who ever heard of/read this book.
As far as picture-type books go-
Damn near anything by Dr. Seuss, especially The Lorax
Where the Wild Things Are
Stories-
The Great Brain series- just thinking about those books makes me want to read them again! Clever, well-written, and an intersting kid-size intro to Mormonism!
Anything by Raymond Briggs.
I was going to collect his whole set, once, but never did. I should investigate doing that, actually. In fact, I may just do that today!
The Very Hungry Caterpillar
My first thought as I opened this thread was “Anything by Dr. Suess!”
For a second choice I’d pick Just Grandma and Me by Mercer Mayer. (The CDROM version is great too. Each page reads you the line, and just about everything in the scene is animated with a click. I donated mine to the daycare at work, and it got lost or stolen somehow. 
)
This summer I attended my sister’s college graduation. The whole family was there, helping her move out of her apartment. One evening she sat us all down–my mom and dad and my adult siblings–and said, “I have to read you this book!” It was The Happy Hocky Family, by Lane Smith. It is just horribly, awfully funny. And she even gave me my own copy! 
FriarTed, I remember that episode. All of Holling C. Holling’s picturebooks are good.
Charlotte’s Web is still one of my favourite books.
Also Matilda - the very fist ‘big’ book I read.
Fox in Socks is one one my favorites. I have over a hundred kid’s books in my house. I can’t have a single favorite.
The Oath of Bad Brown Bill by Stephen Axelson is one of my favourites. Great fun to read to kids, and they love it. Unfortunately out of print these days and very Australian.
Also Dr Seuss and the Very Hungry Caterpillar.
Go Dog, Go! which looks like a Suess book, but is not. I forget the author. Also, Are You My Mother? which may be written by the same non-Suess author.
And, of course, Dr. Suess. 
Definitely the Little Prince (an EXCELLENT read for any age) and the Phantom Tollbooth are *my[i/] favorites.
Thanks.
I second Ukulele Ike on the David Wiesner books! I just bought my baby cousin a copy of Sector 7 for a Christmas/baby present.
Every Christmas I display my copy of Berkeley Breathed’s Red Ranger Came Calling. It has one of the most inspiring, perfect endings I’ve ever seen. (And if you happen upon it in a store, don’t flip to the ending. Let it unfold as it was meant to.)
I like reading Janell Cannon’s books (Verdi, Stellaluna, Trupp etc.). She usually writes about creatures that most people dislike (snakes, roaches, bats), and her artwork is beautiful and humorous. (I have three of her illustrations hanging above my computer.)
My brother gave me Graeme Base’s The Eleventh Hour which requires the reader to solve a mystery by finding clues in each illustration. The pictures are great - very detailed with lots of borrowing from historical places.
The Little House by Virginia Lee Burton is another favorite. It’s fascinating to watch how things change over time (seasons, people, and the landscape).
Another favorite is Michael Bedard’s Sitting Ducks in which a friendship develops between an alligator and a duck - in a town where ducks are grown as food for the gators! The illustrations are Hopperesque and often hilarious.
Like Kyla, I also enjoy Peter Sis’s books. I have: Starry Messenger and Tibet Through the Red Box. The first is about the life of Galileo and that unfortunate business with the Church, and the second is about the author’s father’s adventures in Tibet. Though they are displayed in the children’s sections at bookstores, they seem to be more like picture books for adults. The stories are more sophisticated than most children’s books, and the illustrations can be quite disturbing at times - when Galileo is being tried by the Church, he’s shown standing on a tiny dot of earth while nasty horned creatures, Death, and the Sun, Moon, and planets circle around him. I love the detail, and reading these stories always makes my mind wander down interesting avenues.