Could not find anything about this so here is for those of you not aware:
When fined for a traffic violation you're being registered at the KBA (Kraftfahrt Bundesamt) in Flensburg. They will keep a record of the points you collect. each violation is measured in points. eg calling on your mobile is 3 points. You will also get fined a certain amount to pay.
8-13 Point Intitles you to receive a letter with a recommendation to join a driving school. If done so you can get some points discounted. (usually they send a letter with driving schools in your area with it)
For those who think that showing a foreign licence might help, your wrong. Those are registered as well. It has not been clear to me what is happening if you are driving with a foreign car registration. So far the experience shows that you usually get a fine to pay and that is it.
14-17 Points You are to participate in a Seminar regarding traffic. Deduction of 2 points max.
18 Points - Your licence will be revoked for one month initially.
Under Punktesystem and PunktenKatalog you can find the points for each violation. (unfortunately only in German)
More information, also in English, can be found at http://www.kba.de/ check puntensystem and Im Uberblick. There is a button to swap to English.
The points will be valid between 2, 5 or 10 years depending on the traffic violation. Leaving the country and deregister will not erase them either. The points can only be deducted once in 5 years.
Happy driving
G.