I went into my first preschool search pretty blindly, and very ignorant. I was quickly knocked out by the process and blown away by the prices, but I didn't want to end up like the caricature moms of fiction, going crazy trying to get my kid into preschool against all odds. Fortunately I had a friend who had a good line on a school that turned out to be a perfect fit for our family in every way.
Now that we're mulling the possibility of a move, and now that I have two kids of preschool age, I'm once again dipping into the available resources. Instead of a savvy friend, I've got SavvySource in my arsenal: lists of preschools nationwide, with basic contact information. For select cities, SavvySource has detailed profiles for preschools, complete with information about curricula, teacher education levels, facilities, and a million things I never even thought to wonder about, with information provided by the school and by parent surveys.
Getting into preschool shouldn't be harder than getting into college. Anything that simplifies the process is all right by me.