http://www.aplusmath.com/games/picture/AddPicture.html
http://www.softschools.com/math/games/fishing_add.jsp
http://www.softschools.com/countaddg.jsp
http://www.funbrain.com/cgi-bin/nl.cgi?A1=s&A2=o
http://www.aplusmath.com/flashcards/addition.html
http://www.mathwire.com/numbersense/bfactslinks.html
http://www.sheppardsoftware.com/math.htm