http://www.ixl.com/math/standards/tennessee/grade-2 Math Standards for TN. These are skills that all second graders should know.
http://www.ixl.com/math/grade-2 This is the IXL site for games relating to the standards.
http://www.arcademicskillbuilders.com/ Arcade style games focusing on various math and grammar skills.
http://www.uen.org/3-6interactives/ Interactive games and storymakers.
http://www.internet4classrooms.com/skills_2nd.htm Language and math skills