So it's been out a few weeks but this is great tool for hoster's migrating between IIS 6 and IIS 7 (still in Tech Preview)

http://www.iis.net/downloads/default.aspx?tabid=34&g=6&i=1602

Blurb:

Microsoft has created the Microsoft Web Deployment Tool, which provides deployment and migration support for Internet Information Services versions 6.0 and 7.0. This tool incorporates many features that enable web server administrators to deploy, sync and migrate sites, including configuration, content, SSL certificates and other types of data associated with a Web server. For additional information, please see our documentation.

This tool can be used on Windows Server 2008 and Internet Information Services 7.0 as well as Windows Server 2003 and Internet Information Services 6.0. Please note that this is a Technical Preview release of the tool and should not be used on production servers. As with any pre-release tools or software, you should always backup your system before using it.