Basic Concepts/Word Pairs (i.e.- up,down, in front, behind)
http://www.do2learn.com/games/wordpairs/index.htm
Exclusion/ Differences (i.e.- which one is not a...)
http://www.do2learn.com/games/whatsdifferent/main_bug.htm
Categories/Labeling
http://www.do2learn.com/games/createaroom/index.htm
http://teacher.scholastic.com/activities/bll/nina/index.htm