There's so much out there. Some of it is good but lots of it is garbage. What the very best baby toy you have?
For us it's this butterfly mobile that we hang above DD's crib. The butterflies are completely realistic and made of paper. They float in the breeze and are absolutely beautiful. It was a gift from a friend when DD1 was born. She bought it from a Montessori catalogue that I have long since lost. For both of my kids it's the only thing that really entralls them.
What about your babes?