My son is very motivated by computer games. He'd play them all day if he could. My basic plan is to do Dreambox for math and Reading Eggs for reading as a "formal" teaching tool. Then, there's a science curriculum I'm going to buy because DS is interested in science experiments. Some people have recommended RightStart math, as being developed by a Montessori teacher. It uses an abacus. I might get that for fun.

Mostly, though, I'm going to focus on "stealth learning," going on lots of field trips in the mornings, then do a few more formal things while the little one is sleeping.