These magnetic shapes are great for all aspiring engineers and architects--check out Maziar's impressive design!
TAG is a great toy company, with lots of hands-on educational wood toys. Pull the lever on the number toy below, and the pegs roll out the bottom (like a register, almost). The rainbow gear puzzle is re-arrangeable and stack-able, with a removable lever that turns all the gears on the puzzle.
We didn't get to test this one out at Maz and Ava's house, but it looks fun: kids can trace each letter with its attached moving knob thing-y.