http://www.starfall.com/ MORE STAR FALL is worth the yearly membership. It gives you math games and more. It is a DAILY thing in preschool.
http://www.hiyah.net/online.htm Special needs
http://www.sproutonline.com/sprout/videos/music.aspx?CMP=FB107 There is also a tab for games. I haven't check them out yet though.
http://www.knowledgeadventure.com/ <--- LOVE IT!
http://www.brainpopjr.com/ For K-3+
http://lightupyourbrain.com/games/colored-peg-board/ <--- remember Lite Brite?
http://www.mostlymommies.com/games/infant_games.html <---- simple cause/effect touch game
http://www.funwithspot.com/us/ <---- Spot the Dog!
http://www.netrover.com/~kingskid/108.html has games and smartboard things
http://www.scholastic.com/ispy/ <----- SHOULD BE FUN!!!!!! I SPY!!!
http://www.earobics.com/gamegoo/gooey.html (Thanks to my friend Patti)
http://www.owlieboo.com/ toddler computer exploration, keys, mouse, dragging.
http://www.thomasandfriends.com/ca/Thomas.mvc/Home has links to Barney, Bob the Builder...
http://www.kideos.com/ SAFE kid videos!
http://www.safekidgames.com/ has games listed that I may have missed on here. :D
http://familyfun.go.com/playtime/ <-- not really board interactive but looks like it has great activities
http://www.thekidzpage.com/freekidsgames/index.htm <-- we like this one
http://www.gamersenterprise.com/cats/Children_Games/ <---- bugs bunny, disney character games
http://www.souptoys.com/ free to register, toddler games