Great idea... trace his hand every first day of school.
I think this is the best list I've seen yet.
Cute First Day Picture... Make them write their name to see how their handwriting changes each year. sweetness.
Parent Survey - I send one of these home with my parents every year the first day of school. It helps you get to know your new parents as well as your new students.
Salt Dough Footprint Heart
Time Capsule Idea; create one for each person do this year. then when we go to move, dig up and remember when :)
Measure child in first day of school and see how much they grow on the last day!