Basecamp has done it again recently with their free IM messaging service. Here is how they describe it:
Campfire lets you set up password-protected web-based chat rooms in just seconds. Invite a client, colleague, or vendor to chat, collaborate, and make decisions. Set up a room on your intranet for internal communications.
You can find out more here … Campfire.
Thanks for the tip Zach!
Very interesting. Thanks for the link, both to you and to my fellow Miltonist. 🙂