Flite and Vector;
This is an item that has been brought up at the National level. ATPAC is looking into the problem as it has caused some issues both in the pilot community as well as the controller community.
The controller should tell you cleared to the GRR airport if you are /G, /F, /I or /E. If you are slant most anything else then it should obviously be the VOR that he / she should clear you too. The problem that we run into is that pilots are filing to the airport and NOT to the VOR. You do this by putting GRR GRR in the flight plan. This denotes that you are navigating to the VOR and then to the airport or the arrival fix into the airport ( no one files those anymore either except in training.).
Quite often when the enroute controller clears you 500 miles direct somewhere they don't even know that the place that they have cleared you to doesn't have a colocated VOR or not. You didn't file it in your flight plan <G>. It is also outside of our airspace so we aren't really sure about it.
Oh, as to looking at what Don has written. He has ALL the research done for you <G>...
regards
Scott