If you want a book recommendation, I use the ideas of Siblings Without Rivalry almost every day. Mine are four years apart, so a different set of issues.
My brother and I were less than a year apart, and once we he was in preschool and I was in kindergarten, my mother says it was very smooth sailing, and she loved having us so close together. It made it much easier to plan activities, family vacations, etc., when we were both at about the same stage. So hang on for a couple more years - your reward is coming.
