In the State of the Union, the president called for expanding access to preschool. So it's a subject we're likely to hear more about in the next few days.
As a bunch of people noted on Twitter (thanks!), we did several stories last year on the economics of preschool. Here's a preschool story we did for All Things Considered, a related epidsode of Planet Money, and another preschool story we did for This American Life.