Smart Little Readers: BabyLit®
I am in love with BabyLit's line of classic books for toddlers. The 7"x7" board books use classic works of literature to teach the basics such as numbers, opposites and colors. Jane Austen's Pride & Prejudice is a counting primer, Wuthering Heights offers early lessons about weather (and the perils taking long walks alone in the moors of Yorkshire I'm sure) and Moby Dick, the ocean, natch.
Fair warning to Anglophile parents: the website also includes adorable stuffed canvas characters and 11"x14" prints like this rendering of Mr. Bingley and Mr. Darcy.