In the CTP of the Orcas SDK, we have added a flag that modifies the default behavior of the ZipItems. In previous releases, the ZipItems used to copy the zipped items automatically after zipping them.  However, to get this behavior, you will have to add the following property item in your project:

    <PropertyGroup>
        <RegisterOutputPackage>true</RegisterOutputPackage>
    </PropertyGroup>

You can look at the WebSiteProject.proj project file from the IronPython Integration sample to see where to add this property.