Currently no reciprocal agreement over points on licences within EU. Only one I know of is between France and Switzerland. Think the Swiss and Germans have also started this kind of carry on or were discussing it!
Currently more likely to receive and on the spot fine. If you really take the "p155" - they can confiscate the car on the spot too. (Usually their own locals get this and have to walk home!

)
However, if you pay for hire car by credit card - have heard that they can and have sent the fine tothe hire company who then claw it back from your credit card/switch card details.
You can get a list of all fixed and planned mobile sites by doing a google for "radar fixes" and "bison fute". (Think Mad Doc put the links on the thread Capri refers to. ) The "starenkasten" list on
www.radarfalle.de is also very useful too.