My sister is a pre-K teacher, and she clued me in to a cool program today. Once your baby is born (or now if you already have a little), go to imaginationlibrary.com where you can register to have a free book sent every month from birth until age 5. The only thing is you have to live in a qualifying area and I'm not sure how that's determined, but it's worth a quick zip code check if you love free books!

FTMs, we can't register til baby has an actual birthdate, but I figured I'd post now for mamas who already have littles under 5.
P.S. There are options in Canada and the U.K., in addition to the US
Re: PSA- Potential Free Books