Jake is a huge Dr Seuss fan, at least from what I can tell, he coos and blows spit bubbles... which to me at this point equals excitement. Our favorites are One Fish, Two Fish Red Fish, Blue Fish and Green Eggs & Ham. I'm guessing its Jesse Jackson's favorite too?
A close second is the Look Look Book. My friend Sylvia recommended it for newborns because of the black and white images. Jake can't take his eyes off of it.