Stacking blocks, plastic coffee cans, plastic bowls & spoons from your kitchen cabinet and laundry baskets are all great fun! My son is 18 months & loves his Little People Noah's Ark. He takes the animals in & out, we call them by name (lion, zebra etc) & make their noises, he "feeds" them & puts them to bed. It keeps him really busy. He also like leggos. He has the ones that came in a wagon, so he fills it, empties it & pulls it around the house. Wooden puzzles also help with hand eye cordination. Craft are also good. He can color, finger paint & play with stickers. Here's a couple fun sites:
http://www.crayola.com/ & http://www.familytlc.net/index_toddler.html
Have fun playing & learning.