Photo credit: Kuklev

1. Seesmic: Post a video message and receive video replies from other people
2. Kaltura: Create videos together with other people in real-time
3. Openomy: Online file sharing service gives you 1GB to share your files
4. ManyCam: Use your webcam with multiple source software applications at once

1. Seesmic
   
   Seesmic is an asynchronous video messaging system founded by Loic Le Meur, that you can use pretty much like Twitter. Anyone who is registered, can post a video message about anything, and people can then start adding video replies to it. You can choose whether to follow all public videos, or subscribe to the ones you are interested in. The cool collaborative feature is that you can use Seesmic to power your own blog site comments, allowing people to comment back with their own video clips. Free to use.
   http://www.seesmic.com/





2. Kaltura
   
   Kaltura is an online service that you can use to create videos collaborating with other people. Users can choose topic, pick a look for the Kaltura page, and invite friends to contribute video, music and photos to it, and even edit, remix and annotate it together. The collaborative result can be viewed on Kaltura.com, downloaded for later use, or easily embedded on any site. Free and paid versions available.
   http://corp.kaltura.com/





3. Openomy
   
   Openomy is an online file hosting system that lets you store files and access them from any computer. After you sign-up for the service, you can upload any file, with a total size limitation of 1GB, and create a permalink for any file you add, so that anyone can access and download them. Openomy is completely free to use.
   http://www.openomy.com/





4. ManyCam
   
   ManyCam is a free software for Windows that lets you use your webcam with multiple collaboration applications. ManyCam is able to create virtual webcams that stream data from the real camera, so that it can redistribute it on more instant messaging or videoconferencing tools, so that you can have more conversation, in multiple places, at once. Free to downlaod and use.
   http://www.manycam.com/