function Get-Address ($query) {

    if(!$BingMapsService) {
        $url = "http://dev.virtualearth.net/webservices/v1/geocodeservice/geocodeservice.svc?wsdl"
        $BingMapsService = New-WebServiceProxy $url -Namespace BingMapsGeocodeDemo.BingMapsService
    }

    $c = New-Object BingMapsGeocodeDemo.BingMapsService.Credentials
    $c.ApplicationId = $BingMapsKey

    $request = new-object BingMapsGeocodeDemo.BingMapsService.GeocodeRequest
    $request.Credentials = $c
    $request.Query = $query

    $BingMapsService.Geocode($request)
}

function Get-DisplayName($query="NYC") {
    Get-Address $query | select -ExpandProperty results | select displayname
}

Get-DisplayName dallas