Peep and the Big Wide World is a great site for K-2 kids. This site is directly connected to the animated television series designed for early learners.The show airs locally for us on GPB. The site has activities, games, music, videos, and is directly linked to all the episodes. One example is Trash Stash, where items are sorted into like groups of four.
Main URL: http://www.peepandthebigwideworld.com/games/trashstash.html