Douglas,
The German war graves website is at
http://www.volksbund.de/
It is all in German, but if you go here
http://www.axishistory.com/index.php?id=3595 you will find directions in English on how to search for a grave.
There have been slight changes since the instructions were written, so on the
http://www.volksbund.de/ page, look at the light blue buttons on the left side of the page, and click on '
Grabersuche'. This will take you to a page which has a small photo on it. To the right of this it says '
...zur olinesuche', clicking on this will take you to the page where you can enter the details of the person you are looking for the grave of.
It seems that if a person has no known grave, a search will return a 'not found' result, unlike the CWGC, where you will still get a result. Perhaps unlike the CWGC, the Germans do not commemorate those who have no known grave on memorials.
Geoff.
Geoff.