Baking and cooking supplies:cookbook, colorful mixing bowls and measuring cups, chef hat, even a cooking class. My 8-year-old son loves things like this.
Agree with the previously mentioned science kits, Legos, robotics kits (though the latter tend to be REALLY expensive).
Magazine subscriptions are great presents. My son has always loved the ones from this company; you can choose by topic and age:
http://www.cricketmag.com/ProductList.aspx?type=M
Fatbraintoys.com has a great selection; not sure if it's too late to order at this point.