Homeschool mom of 3

http://www.educational-freeware.com/freeware/category-Mathematics.aspx

http://www.kidsfreeware.com/

(for the one above scroll to Study with fun)

Clever Island is p2p but a lot of people rave about it:

http://www.cleverisland.com/

Online we use:

http://www.coolmath4kids.com/

http://www.abc.net.au/countusin/games.htm

http://www.rainforestmaths.com/

http://www.funbrain.com/

And these are a couple a souple compendiums of different games all over the web:

http://www.k111.k12.il.us/king/math.htm

http://childparenting.about.com/od/mathgamesonline/index.htm

Hope you find something you like! Good Luck!

coolmath4kids.com

primarygames.com

coolmath-games.com

theschoolbell.com

pbs.org (my other favorite)

http://www.coolmath4kids.com/

http://www.edina.k12.mn.us/creekvalley/staffdev/Internet%20Sites/studentsites.htm

http://www.rainforestmaths.com/