KidsCom

An educational and entertaining site for kids 4 to 12. Games, monitored chat, and a creation center.
http://www.kidscom.com/

Kids Online

Includes chat, message board, pager system, and search engine.
http://www.kids-online.com/

hbzChat

Variety of scheduled chat rooms for kids. Moderated.
http://www.headbone.com/friends/chat/

Online Chat Network

Various chat rooms to choose from. Meet people from all over the globe.
http://www.angelfire.com/ct/ocn/kids.html

YouthNOISE

Nonprofit affiliated with Save the Children Federation, provides teens with a forum to express themselves and take action. Includes message boards and e-mail.
http://youthnoise.com

KidFu: The Way of the Kid

A fully monitored safe online community for kids, featuring kids chat, a kid-written magazine, bulletin boards, games, and junior jobs. Membership is required for full access.
http://www.kidfu.com/

KidsChatters

Variety of chat rooms for kids. Paid registration required.
http://www.kidchatters.com/

TeenTalk Central

Chats and discussion forums for youth in the UK.
http://www.teentalkcentral.org.uk/

Kids' Turn Central

Safe, adult monitored chat room for kids under 16. Room is only open when monitor is available.
http://www.kidsturncentral.com/chatindex.htm

Young Programmers Network

Message boards, chat and information on various programming languages.
http://www.youngprogrammers.net/

CurvedSpace

Includes games, multiple chats, forums, and jokes.
http://www.cspacezone.com/

Open Site Public Forum

Message board of the Open Encyclopedia Project. Offers social and topical discussions.
http://open-site-talk.org/