A book with cardboard pages, which resist tearing and are thick enough to be turned by tiny, uncoordinated fingers.
My daughter loved the Bartholemew Bear books (here’s one). They’re all about little life lessons, including ‘Go to Bed!’ but they’re not that dogmatic. The bear says ‘nah!’ a lot in speech bubbles, which were the first thing my daughter learnt to ‘read.’
Janet and Allen Ahlberg’s ‘Peepo!’ is a book with longevity; younger ones will like the rhythm and rhyme and revealing what the baby’s seeing, and older ones like the old-fashioned things in the picture (it’s set in the 40s or so).
Don’t stop now! You need to add some Elmer to that list! You can get one of them as a bilingual English/Arabic board book.
Elmer even comes as a bath book… 
Oh duh, sorry, I didn’t read the OP very well or I would have realized you already had Good Night Gorilla! Oh well. Yes, it’s awesome! Probably the most reliable favorite we have (she comes and goes on most of the others)
Speaking of which, the Little One didn’t like Caterpillar until about a month ago (~16 months), but since then she’s looooved sticking her fingers in the holes.
I adored Good Night Gorilla. That page with all the eyes in the dark. The gorilla’s smile!
My daughter liked this when she was older:
http://www.amazon.com/gp/aw/d/0064438368/ref=redir_mdp_mobile/180-3848702-0471206
I’ve seen it in board book and regular book.
She also loved a book called tails (there’s a sequel now). It’s a touch and feel book. It’s not a board book per say, but I recall the pages as being thicker than normal.
pbbth you should check out I Lego NY. It’s hilarious for NYC babbys and their parents.
Brown bear, Brown bear!
OOOOOOOOOOOH…
I was thinking perhaps it was one recommended by the dope message board or something. Thanks, I’d never heard them called that.
This one absolutely.
I had it for my kids when they were little, and now for my 20 month old grandson.
A must have.
I Love You, Stinky Face is a cute one that never makes these lists.
All right, you enablers. Added:
[ul]
[li]I Love You, Stinky Face[/li][li]Peepo![/li][li]Where Is Baby’s Belly Button?[/li][li]Be Gentle! (Bartholomew Bear)[/li][li]I Stink![/li][/ul]
We already have Brown Bear, Brown Bear, What Do You See? but again, for whatever top-secret baby reason, the boylet won’t sit still for it yet.
Moving thread from IMHO to Cafe Society.
Feelings- David Salariya for Brighter Baby
There are photos of babies.
Sad, angry, happy, loved, puzzled, worried and weary.
Sample
“Look at me, today I am a happy baby, I still need cuddles, even though I am very, very happy.”
Irishbaby, at nearly two, knows all the words (including “bewildered” and “frustrated”) and loves this book best of all.
We went with the classics, upgraded as the years passed: The Velveteen Rabbit and Peter Rabbit (and friends). Guess How Much I Love You is nice, too.
Lot’s of great suggestions here. I scanned the replies and didn’t see this one mentioned yet, but apologies if it’s already been posted. A favorite of my son’s is I’ll See You in the Morning: