Baby Educational Toys?

I don't spend much time thinking about the toys my son plays with, although we do go to Toys R Us occasionally and see a slew of baby educational toys. He has a toy laptop, which has taught him, pretty much, how to slide the cartridges in and out! We choose pretty basic or "classic" toys, and he seems to enjoy them. I never thought much about toys as educational objects. Meaning, I have never tested him to see if a particular toy has helped teach him a concept. Maybe I should think about that. I assumed when he got a bit older he would get into Legos, puzzles, or games but as of right now, I don't really direct his toy play at all.