Thinking of hosting SharePoint?

Then take a look at the Microsoft Solution for Hosted Messaging and Collaboration version 4.0

(Thanks to Mark for this pointer)

"Microsoft Windows SharePoint Services is the safe and cost-effective choice for organizations looking to deploy best-of-breed collaboration applications to increase team productivity and cross-company information sharing. Windows SharePoint Services is also a versatile foundation for Web-based business applications for increased process efficiency and improved information flow.

The Microsoft Windows SharePoint Services Hosting component enables you to provide customers with team-oriented Web sites for information sharing and collaboration. This compelling business application provides another opportunity to increase average revenue per user."

[Amended] - i've just seen on the SharePoint site there's now a Hosting Community Site with lots of useful info and code. https://www.codeplex.com/SharePointHosters