It is important to note that Microsoft is working on a new technology code-named Dublin (which will probably become something like Windows Application Server when the marketing guys get their way) that aims to make it easy to deploy and manage your WCF and WF applications and services, and will probably become the preferred means of hosting services.
At the time of writing, Dublin will ship as an add-in to Windows Server 2008 and will be contained in future versions of Windows as part of the application server role.
Dublin is an extension to IIS, and Microsoft say will provide the following functionality:
Easier deployment of workflow and services
An overview of service health and a dashboard for monitoring services
Tools for easier management of services
Forwarding/routing functionality
Built-in tracking profiles for monitoring common events
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