my boys aren't into mighty beans but as far as I can tell they are small collectable weebles. http://www.mightybeanz.com/
Currently my boys covet beyblades and pokemons.
"Someday, I am going to go to bed without toys on the floor and sippys in my sink. Things will stay where I put them and I can have nice, fragile items on display. But when I do, I will look around with a wistfullness in my heart and miss the days where vibrant imaginations ran wild and there was evidence of life happening around me all the time!"