MeBeam.com, K-12

http://www.mebeam.com/
MeBeam is a free chat room platform with built-in audio and video capabilities. This means users can get a real time group conversation going with friends around the world. To start a chat type in a title for your room or find an existing chat to join. Invite friends by pressing the Invite People button. Up to 18 people may join in on the conversation. Users may upload files (less than 30 mb) for others in the room to share.