Google Docs, Zoho Writer, and services like them are good for collaborative document and presentation creation. What they lack however is a way for groups to assign tasks to its members and to keep track of those tasks as they’re completed.

This where Kohive comes in. Kohive provides a suite of tools for collaborative project creation and project management. In Kohive you can create multiple group projects and manage each project separately. Kohive provides a desktop-like suite of tools such as stickies, documents, scheduling, and file sharing that all members of your group can access. You can also share videos, share pictures, and create drawings (think team whiteboarding) on Kohive.
Source : Free Technology for Teachers
Embed A Forum To Your Blog
Yesterday, the folks behind Lefora launched Tal.ki. Tal.ki allows you to create a discussion forum and embed it into your blog or website in seconds.

To add a discussion forum to your blog or website simply go to Tal.ki, copy the embed code and paste it into the code of your blog or website. You do not have to create an account to use Tal.ki nor do visitors to your embedded forum have to create a Tal.ki account. Users of Tal.ki login using their Facebook, Google, Yahoo, or Twitter accounts.
Source : Free Technology For Teachers
Board800 is a simple service that enables anyone to create a collaborative whiteboard space in seconds. Board800’s primary functionality is drawing shapes and creating designs, but text can be easily added too.
Source : Free Technology For Teachers
The BBC, as a part of it’s Superpower series, has created these slides showing how the web works