Our good friend Kip Ng shares his latest exploration into hosting SharePoint 2010 multitenancy:
http://blogs.technet.com/b/provtest/archive/2010/08/06/sharepoint-2010-multi-tenancy-support-for-hosters-it-is-there-if-you-want-it.aspx
Please read this now to get a leg up on hosting SharePoint 2010!
Marcel MessingHOSTING TSP
(thx Kip!)