My kids like playing on webkinz.com, nickjr.com, etc.
www.TVOkids.com and www.YTV.com - both Canadian TV networks similar to Nick or Nick Jr.
www.netsmartzkids.org - they just posted a new video about tricks predators can use to get kids to leave with them. such a great web site - and it has NO links to any other sites.
i also want to recommend www.netsmartz411.org
My DS loves clubpenguin.com too! can't count the number of times I"ve helped with a mission!
These are great!