Web Deployment Tool
It appears that the IIS team at Microsoft has officially completed a 1.0 version of the deployment utility I mentioned at the end of my previous post about Visual Studio Web Deployment Projects almost two years ago. It includes a command-line tool named MSDeploy that helps with deploying and syncing web projects across all of the web servers in your server farm. The installation also includes all kinds of packaging and deployment features that seem really handy. You can even do migrations from IIS 6 to IIS 7 or package your apps to be distributed via the Microsoft Web Platform Installer.
I thought that maybe the tool creates MSI installers, but it appears the package may actually just be a ZIP file that you can import and export through the IIS Manager or various other command-line tools or PowerShell Cmdlets.
Here is the page where you can read more about the toolset and download the installer: http://www.iis.net/extensions/WebDeploymentTool