If you read my last but one post, you 'll have read the list of Australian CEOs that Twitter. Here's a corporate version of Twitter called Yammer:
What's happening at your company?yes
Share status updates with your co-workers.Your Network
Yammer is a tool used to communicate, share, and stay in touch with others in your organization through the exchange of short frequent messages. These messages are aggregated into a feed that is private to your network. Only others with confirmed email addresses from your organization can view and post messages to your feed.
Your Yammer network name is the hostname of your email address. For example, you can only log in to the Geni Yammer network if you have verified that you have a valid @geni.com email address. Once you have verified that you have a valid email address from your organization, you can log in to that network to view and post messages.
It just won the main TechCrunch award at the Crunchies.
Link to original post