A friend and I have been teaching our almost 3-yr-olds preschool in our homes. It's been awesome. It's little more than structured playtime, but every so often we see a light bulb go on, so we press forward. Lessons are based on one letter per day.
Usually on the nights before school mornings, we try to prep Tessa. She loves school, so the prep is totally enjoyable, like last night's conversation:
Me: Tessa, guess what tomorrow is!
Tessa: [eyes widening and grin slowly uncurling] Schoooool??
Me: Yes! And do you know what letter you're learning tomorrow? "R"!
Tessa: R. rrrr...rrrrr...
Me: That's right. "R" makes the "rrr" sound. What word starts with "R"?