Photo credit: Brunoil

1. Roomatic: Create chatrooms with Twitter posts
2. Scour: Search for things, leave comments, vote and filter results
3. LiveVideo: Create your channel to stream your video and talk with other people
4. Streaming Rooms: Aggregate multiple Ustream videos into one conferencing room

1. Roomatic
   
   Roomatic is a web based app that you can use to create chat rooms using Twitter. To create a room, all you need to do is to give it a name, login with your Twitter credentials, and start posting: people will be able to add responses, and it will just look like a normal chatroom, with the only difference that you are using your Twitter account to post messages. Free.
   http://www.roomatic.com/







2. Scour
   Scour is a social search engine that allows people to interact with searching stuff on the Internet. When you make a research, results from Google, Yahoo and MSN will gather on the page: you can then filter your research, vote and comment on any result so that you can help people will search for the same things. Scour is completely free to use.
   http://scour.com/






3. LiveVideo
   
   LiveVideo is a free website where you can create your own video channel and stream your webcam video. After you create your channel, users can start watching you and add their own webcams to create a conference room where you can talk and text-chat. Registration is needed in order to use the service.
   http://www.livevideo.com/






4. Streaming Rooms
   
   Streaming Rooms is an online service that allows you to create rooms where you can import Ustream players. After you login and create a room, you can start aggregating the Ustream players into the room, so that you can actually create a video conferencing room at absolutely no cost. The service is free to use, registration is needed.
   http://www.streamingrooms.com/