Yesterday I did a video on a cool service called Yammer (http://yammer.com). What Yammer allows you to do is make something similar to a twitter page for your business. In this sense this allows employees from a small, medium, or large business to collaborate just as people do on twitter.
Yammer takes it a step further than twitter and allows co-workers to post attachments and even assign roles or positions to users. I truly love this idea/concept and I can see modernized business taking this and running. In my mind this is a great way for employees from all over the nation or even globe to collaborate and share experiences that will not only help the employee learn but also help your business or organization accomplish tasks in a more efficient manner.
For more information please watch the video:

