$package = new-package "Package for something special";
$package.Sources.Clear();
$package.Metadata.Author = "Michael West";
$package.Metadata.Publisher = "Scripting in Powerful Ways Team";
$package.Metadata.Version = "2.7";
$package.Metadata.Readme = 'This text will be visible to people installing your package'
# Add contnet/home to the package
$source = Get-Item 'master:\content\home' | New-ItemSource -Name 'Home Page' -InstallMode Overwrite
$package.Sources.Add($source);
Export-Package -Project $package -Path "$($package.Name)-$($package.Metadata.Version).zip" -Zip
# Offer the user to download the package
Download-File "$SitecorePackageFolder\$($package.Name)-$($package.Metadata.Version).zip"