Google Apps for Your Domain - better late than never

Google Apps for Your Domain: "Now you can offer private-labeled email, IM and calendar tools to all of your users for free*, so they can share ideas and get things done more effectively. You can design and publish your organization's website, too. It's all hosted by Google, so there's no hardware or software for you to install or maintain."

Link:
https://www.google.com/a/