There is nothing on this planet that is cuter, as far as I think, right now than Jackson waving.
It all starts with his hand in a fist, turned towards his face. Slowly he opens and closes his chubby little fingers, usually with his tongue hanging out of his mouth, (the definite sign of deep concentration.) Once he gets his fingers going he turns his hand around to face whoever he's waving bye bye to and of course he throws in a big grin to make it even cuter. (That whole I'm-so-excited-that-I'm doing-it-grin.)
My favorite is when he gets super excited and this action requires two hands. Both hands frantically opening and closing, the grin growing even larger to show his two teeth...I love this age! I love that everything is new to him. The other day I managed to entertain him for at least 10 minutes with the wrapper of a straw. Boring to you and me but it was pure discovery bliss to him. I love that!