Love this thread!
We're book people too!
I LOVE the Richard Scarry books- with Huckle and Lowly- some many little details to look at and loads of silly little things- like pickle cars.
For photo- info books, DK publishers makes nice board books, and some more advanced books as well- nice photos of animals, trucks, etc. "My first Truck book" ETc... Very simple, but LOs love the photos.
P.D. Eastman wrote/illustrated "Go Dog Go" and it's one of Nick's favorites. Again, simple, but great for beginner readers, simple concepts of colors, up and down, over and under, etc.
I'll think some more...